International Mathematical Olympiad

The logo of the International Mathematical Olympiad

The International Mathematical Olympiad (IMO) is a mathematical olympiad for pre-university students, and is the oldest of the International Science Olympiads. ^[1] It is "the most prestigious" mathematical competition in the world. The first IMO was held in Romania in 1959. It has since been held annually, except in 1980. More than 100 countries participate. Each country sends a team of up to six students, ^[2] plus one team leader, one deputy leader, and observers. ^[3]

The content ranges from extremely difficult algebra and pre-calculus problems to problems in branches of mathematics not conventionally covered in secondary or high school and often not at university level either, such as projective and complex geometry, functional equations, combinatorics, and well-grounded number theory, of which extensive knowledge of theorems is required. Calculus, though allowed in solutions, is never required, as there is a principle that anyone with a basic understanding of mathematics should understand the problems, even if the solutions require a great deal more knowledge. Supporters of this principle claim that this allows more universality and creates an incentive to find elegant, deceptively simple-looking problems which nevertheless require a certain level of ingenuity, often times a great deal of ingenuity to net all points for a given IMO problem.

The selection process differs by country, but it often consists of a series of tests which admit fewer students at each progressing test. Awards are given to approximately the top-scoring 50% of the individual contestants. Teams are not officially recognized—all scores are given only to individual contestants, but team scoring is unofficially compared more than individual scores. ^[4] Contestants must be under the age of 20 and must not be registered at any tertiary institution. Subject to these conditions, an individual may participate any number of times in the IMO. ^[5]

History

See also: List of International Mathematical Olympiads

The first IMO was held in Romania in 1959. Since then it has been held every year (except in 1980, when it was cancelled due to internal strife in Mongolia). ^[6] It was initially founded for eastern European member countries of the Warsaw Pact, under the USSR bloc of influence, but later other countries participated as well. ^[2] Because of this eastern origin, the IMOs were first hosted only in eastern European countries, and gradually spread to other nations. ^[7]

Sources differ about the cities hosting some of the early IMOs. This may be partly because leaders and students are generally housed at different locations, and partly because after the competition the students were sometimes based in multiple cities for the rest of the IMO. The exact dates cited may also differ, because of leaders arriving before the students, and at more recent IMOs the IMO Advisory Board arriving before the leaders. ^[8]

Several students, such as Lisa Sauermann, Reid W. Barton, Nicușor Dan and Ciprian Manolescu have performed exceptionally well in the IMO, winning multiple gold medals. Others, such as Terence Tao, Artur Avila, Grigori Perelman, Ngô Bảo Châu and Maryam Mirzakhani have gone on to become notable mathematicians. Several former participants have won awards such as the Fields Medal. ^[9]

Scoring and format

The competition consists of 6 problems. The competition is held over two consecutive days with 3 problems each; each day the contestants have four-and-a-half hours to solve three problems. Each problem is worth 7 points for a maximum total score of 42 points. Calculators are banned. Protractors were banned relatively recently. ^[10] Unlike other science olympiads, the IMO has no official syllabus and does not cover any university-level topics. The problems chosen are from various areas of secondary school mathematics, broadly classifiable as geometry, number theory, algebra, and combinatorics. They require no knowledge of higher mathematics such as calculus and analysis, and solutions are often elementary. However, they are usually disguised so as to make the solutions difficult. The problems given in the IMO are largely designed to require creativity and the ability to solve problems quickly. Thus, the prominently featured problems are algebraic inequalities, complex numbers, and construction-oriented geometrical problems, though in recent years, the latter has not been as popular as before because of the algorithmic use of theorems like Muirhead's inequality, and complex/analytic bashing to solve problems. ^[11]

Each participating country, other than the host country, may submit suggested problems to a problem selection committee provided by the host country, which reduces the submitted problems to a shortlist. The team leaders arrive at the IMO a few days in advance of the contestants and form the IMO jury which is responsible for all the formal decisions relating to the contest, starting with selecting the six problems from the shortlist. The jury aims to order the problems so that the order in increasing difficulty is Q1, Q4, Q2, Q5, Q3 and Q6, where the first day problems Q1, Q2, and Q3 are in increasing difficulty, and the second day problems Q4, Q5, Q6 are in increasing difficulty. The team leaders of all countries are given the problems in advance of the contestants, and thus, are kept strictly separated and observed. ^[12]

Each country's marks are agreed between that country's leader and deputy leader and coordinators provided by the host country (the leader of the team whose country submitted the problem in the case of the marks of the host country), subject to the decisions of the chief coordinator and ultimately a jury if any disputes cannot be resolved. ^[13]

Selection process

A stage in the process of solving a problem from the AIME, part of the United States' selection process.

Main article: International Mathematical Olympiad selection process

The selection process for the IMO varies greatly by country. In some countries, especially those in East Asia, the selection process involves several tests of a difficulty comparable to the IMO itself. ^[14] The Chinese contestants go through a camp. ^[15] In others, such as the United States, possible participants go through a series of easier standalone competitions that gradually increase in difficulty. In the United States, the tests include the American Mathematics Competitions, the American Invitational Mathematics Examination, and the United States of America Junior Mathematical Olympiad/United States of America Mathematical Olympiad, each of which is a competition in its own right. For high scorers in the final competition for the team selection, there also is a summer camp, like that of China. ^[16]

In countries of the former Soviet Union and other eastern European countries, a team has in the past been chosen several years beforehand, and they are given special training specifically for the event. However, such methods have been discontinued in some countries. ^[17]

Awards

The participants are ranked based on their individual scores. Medals are awarded to the highest ranked participants; slightly fewer than half of them receive a medal. The cutoffs (minimum scores required to receive a gold, silver, or bronze medal respectively) are then chosen so that the numbers of gold, silver and bronze medals awarded are approximately in the ratios 1:2:3. Participants who do not win a medal but who score 7 points on at least one problem receive an honorable mention. ^[18]

Special prizes may be awarded for solutions of outstanding elegance or involving good generalisations of a problem. This last happened in 1995 (Nikolay Nikolov, Bulgaria) and 2005 (Iurie Boreico), but was more frequent up to the early 1980s. ^[19] The special prize in 2005 was awarded to Iurie Boreico, a student from Moldova, for his solution to Problem 3, a three variable inequality.

The rule that at most half the contestants win a medal is sometimes broken if it would cause the total number of medals to deviate too much from half the number of contestants. This last happened in 2010 (when the choice was to give either 226 (43.71%) or 266 (51.45%) of the 517 contestants (excluding the 6 from North Korea — see below) a medal), ^[20] 2012 (when the choice was to give either 226 (41.24%) or 277 (50.55%) of the 548 contestants a medal), and 2013, when the choice was to give either 249 (47.16%) or 278 (52.65%) of the 528 contestants a medal. In these cases, slightly more than half the contestants were awarded a medal. ^{[21] [22]}

Some of gold medal contestants during the IMO 2015 closing ceremony, Chiang Mai Thailand

Penalties and bans

North Korea was disqualified twice for cheating, once at the 32nd IMO in 1991 ^[23] and again at the 51st IMO in 2010. ^[24] However, the incident in 2010 was controversial. ^{[25] [26]} There have been other cases of cheating where contestants received penalties, although these cases were not officially disclosed. (For instance, at the 34th IMO in 1993, a contestant was disqualified for bringing a pocket book of formulas, and two contestants were awarded zero points on second day's paper for bringing calculators. ^[27] )

Russia has been banned from participating in the Olympiad since 2022 as a response to its invasion of Ukraine. ^[28] Nonetheless, a limited number of students (specifically, 6) are allowed to take part in the competition and receive awards, but only remotely and with their results being excluded from the unofficial team ranking. Slightly more than a half of the IMO 2021 Jury members (59 out of 107) voted in support of the sanction proposed by the IMO Board. ^[28]

Summary

Members of the 2007 IMO Greek team.

See also: List of International Mathematical Olympiads and List of countries by medal count at International Math Olympiad

The four perfect scorers in the 2001 IMO. From left to right: Gabriel Carroll, Reid Barton (both United States), Liang Xiao and Zhiqiang Zhang (both China).

The Bangladesh team at the 2009 IMO

Serbia's team for the 2010 IMO

Zhuo Qun (Alex) Song (Canadian), the most highly decorated IMO contestant with 5 golds and 1 bronze medal

Maryam Mirzakhani (Iran), the first woman to be honored with a Fields Medal, won 2 gold medals in 1994 and 1995, getting a perfect score in the second year.

	Venue	Year	Date	Top-ranked country [29]	Refs
1	Brașov and Bucharest	1959	July 21–31 [30]	Romania	[31]
2	Sinaia	1960	July 18–26	Czechoslovakia	[31]
3	Veszprém	1961	July 6–16	Hungary	[31]
4	České Budějovice	1962	July 7–15		[31]
5	Warsaw and Wrocław	1963	July 5–13	Soviet Union	[31]
6	Moscow	1964	June 30 – July 10		[31]
7	East Berlin	1965	July 3–13		[31]
8	Sofia	1966	July 1–14		[31]
9	Cetinje	1967	July 2–13		[31]
10	Moscow	1968	July 5–18	East Germany	[31]
11	Bucharest	1969	July 5–20	Hungary	[31]
12	Keszthely	1970	July 8–22		[31]
13	Žilina	1971	July 10–21		[31]
14	Toruń	1972	July 5–17	Soviet Union	[31]
15	Moscow	1973	July 5–16		[31]
16	Erfurt and East Berlin	1974	July 4–17		[31]
17	Burgas and Sofia	1975	July 3–16	Hungary	[31]
18	Lienz	1976	July 7–21	Soviet Union	[31]
19	Belgrade	1977	July 1–13	United States	[31]
20	Bucharest	1978	July 3–10	Romania	[31]
21	London	1979	June 30 – July 9	Soviet Union	[31]
	The 1980 IMO was due to be held in Mongolia. It was cancelled, and split into two unofficial events in Europe. [32]
22	Washington, D.C.	1981	July 8–20	United States	[31]
23	Budapest	1982	July 5–14	West Germany	[31]
24	Paris	1983	July 1–12		[31]
25	Prague	1984	June 29 – July 10	Soviet Union	[31]
26	Joutsa	1985	June 29 – July 11	Romania	[31]
27	Warsaw	1986	July 4–15	Soviet Union  United States	[31]
28	Havana	1987	July 5–16	Romania	[31]
29	Sydney and Canberra	1988	July 9–21	Soviet Union	[31]
30	Braunschweig	1989	July 13–24	China	[31]
31	Beijing	1990	July 8–19		[31]
32	Sigtuna	1991	July 12–23	Soviet Union	[31]
33	Moscow	1992	July 10–21	China	[31]
34	Istanbul	1993	July 13–24		[31]
35	Hong Kong	1994	July 8–20	United States	[31]
36	Toronto	1995	July 13–25	China	[33]
37	Mumbai	1996	July 5–17	Romania	[34]
38	Mar del Plata	1997	July 18–31	China	[35]
39	Taipei	1998	July 10–21	Iran	[36]
40	Bucharest	1999	July 10–22	China  Russia	[37]
41	Daejeon	2000	July 13–25	China	[38]
42	Washington, D.C.	2001	July 1–14		[39]
43	Glasgow	2002	July 19–30		[40]
44	Tokyo	2003	July 7–19	Bulgaria	[41]
45	Athens	2004	July 6–18	China	[42]
46	Mérida	2005	July 8–19		[43]
47	Ljubljana	2006	July 6–18		[44]
48	Hanoi	2007	July 19–31	Russia	[45]
49	Madrid	2008	July 10–22	China	[46]
50	Bremen	2009	July 10–22		[47]
51	Astana	2010	July 2–14		[48]
52	Amsterdam	2011	July 12–24		[49]
53	Mar del Plata	2012	July 4–16	South Korea	[50]
54	Santa Marta	2013	July 18–28	China	[51]
55	Cape Town	2014	July 3–13		[52]
56	Chiang Mai	2015	July 4–16	United States	[53]
57	Hong Kong	2016	July 6–16		[54]
58	Rio de Janeiro	2017	July 12–23	South Korea	[55]
59	Cluj-Napoca	2018	July 3–14	United States	[56]
60	Bath	2019	July 11–22	China  United States	[57]
61	Saint Petersburg (virtual)	2020	September 19–28	China	[58] [59] [60] [61]
62	Saint Petersburg (virtual)	2021	July 7–17		[62] [n 1]
63	Oslo	2022	July 6–16		[64]
64	Chiba	2023	July 2–13		[65]
65	Bath	2024	July 11–22	United States	[66] [67] [n 2]
66	Sunshine Coast	2025	July 10–20		[69]
67	Shanghai	2026			[70]
68	(TBA)	2027			[71]
69	(TBA)	2028			[72]

Notable achievements

National

The following nations have achieved the highest team score in the respective competition:

• China, 24 times: in 1989, 1990, 1992, 1993, 1995, 1997, 1999 (joint), 2000, 2001, 2002, 2004, 2005, 2006, 2008, 2009, 2010, 2011, 2013, 2014, 2019 (joint), 2020, 2021, 2022, 2023; ^[73]
• Russia (including Soviet Union), 16 times: in 1963, 1964, 1965, 1966, 1967, 1972, 1973, 1974, 1976, 1979, 1984, 1986 (joint), 1988, 1991, 1999 (joint), 2007; ^{[74] [75]}
• United States, 9 times: in 1977, 1981, 1986 (joint), 1994, 2015, 2016, 2018, 2019 (joint), 2024; ^[76]
• Hungary, 6 times: in 1961, 1962, 1969, 1970, 1971, 1975; ^[77]
• Romania, 5 times: in 1959, 1978, 1985, 1987, 1996; ^[78]
• West Germany, twice: in 1982 and 1983; ^[79]
• South Korea, twice: in 2012 and 2017; ^[80]
• Bulgaria, once: in 2003; ^[81]
• Iran, once: in 1998; ^[82]
• East Germany, once: in 1968. ^[83]

The following nations have achieved an all-members-gold IMO with a full team:

• China, 15 times: in 1992, 1993, 1997, 2000, 2001, 2002, 2004, 2006, 2009, 2010, 2011, 2019, 2021, 2022 and 2023. ^[73]
• United States, 4 times: in 1994, 2011, 2016, and 2019. ^[76]
• South Korea, 3 times: in 2012, 2017, and 2019. ^[80]
• Russia, twice: in 2002 and 2008. ^[74]
• Bulgaria, once: in 2003. ^[84]

The only countries to have their entire team score perfectly in the IMO were the United States in 1994, China in 2022, and Luxembourg, whose 1-member team had a perfect score in 1981. The US's success earned a mention in TIME Magazine . ^[85] Hungary won IMO 1975 in an unorthodox way when none of the eight team members received a gold medal (five silver, three bronze). ^[77] Second place team East Germany also did not have a single gold medal winner (four silver, four bronze). ^[83]

The current ten countries with the best all-time results are as follows: ^[86]

Country	Appearances	Gold	Silver	Bronze	Honorable mentions
China	39	185	37	6	0
United States	50	151	120	30	1
Russia	30	106	62	12	0
South Korea	37	95	83	28	7
Hungary	64	88	174	116	10
Romania	65	86	158	111	7
Soviet Union [n 3]	29	77	67	45	0
Vietnam	48	69	117	85	3
Bulgaria	65	57	130	121	15
United Kingdom	57	56	124	131	18

Individual

See also: List of International Mathematical Olympiad participants

Several individuals have consistently scored highly and/or earned medals on the IMO: Zhuo Qun Song (Canada) is the most highly decorated participant ^[87] with five gold medals (including one perfect score in 2015) and one bronze medal. ^[88] Reid Barton (United States) was the first participant to win a gold medal four times (1998–2001). ^[89] Barton is also one of only eight four-time Putnam Fellows (2001–04). Christian Reiher (Germany), Lisa Sauermann (Germany), Teodor von Burg (Serbia), Nipun Pitimanaaree (Thailand) and Luke Robitaille (United States) are the only other participants to have won four gold medals (2000–03, 2008–11, 2009–12, 2010–13, 2011–14, and 2019–22 respectively); Reiher also received a bronze medal (1999), Sauermann a silver medal (2007), von Burg a silver medal (2008) and a bronze medal (2007), and Pitimanaaree a silver medal (2009). ^[90] Wolfgang Burmeister (East Germany), Martin Härterich (West Germany), Iurie Boreico (Moldova), and Lim Jeck (Singapore) are the only other participants besides Reiher, Sauermann, von Burg, and Pitimanaaree to win five medals with at least three of them gold. ^[2] Ciprian Manolescu (Romania) managed to write a perfect paper (42 points) for gold medal more times than anybody else in the history of the competition, doing it all three times he participated in the IMO (1995, 1996, 1997). ^[91] Manolescu is also a three-time Putnam Fellow (1997, 1998, 2000). ^[92] Eugenia Malinnikova (Soviet Union) is the highest-scoring female contestant in IMO history. She has 3 gold medals in IMO 1989 (41 points), IMO 1990 (42) and IMO 1991 (42), missing only 1 point in 1989 to precede Manolescu's achievement. ^[93]

Terence Tao (Australia) participated in IMO 1986, 1987 and 1988, winning bronze, silver and gold medals respectively. He won a gold medal when he just turned thirteen in IMO 1988, becoming the youngest person ^[94] to receive a gold medal (Zhuo Qun Song of Canada also won a gold medal at age 13, in 2011, though he was older than Tao). Tao also holds the distinction of being the youngest medalist with his 1986 bronze medal, followed by 2009 bronze medalist Raúl Chávez Sarmiento (Peru), at the age of 10 and 11 respectively. ^[95] Representing the United States, Noam Elkies won a gold medal with a perfect paper at the age of 14 in 1981. Both Elkies and Tao could have participated in the IMO multiple times following their success, but entered university and therefore became ineligible.

Gender gap and the launch of European Girls' Mathematical Olympiad

Over the years, since its inception to present, the IMO has attracted far more male contestants than female contestants. ^{[96] [97] [98]} During the period 2000–2021, there were only 1,102 female contestants (9.2%) out of a total of 11,950 contestants. The gap is even more significant in terms of IMO gold medallists; from 1959 to 2021, there were 43 female and 1295 male gold medal winners. ^[99]

This gender gap in participation and in performance at the IMO level led to the establishment of the European Girls' Mathematical Olympiad (EGMO). ^[100]

Media coverage

• A documentary, "Hard Problems: The Road To The World's Toughest Math Contest" was made about the United States 2006 IMO team. ^[101]
• A BBC documentary titled Beautiful Young Minds aired July 2007 about the IMO.
• A BBC fictional film titled X+Y released in September 2014 tells the story of an autistic boy who took part in the Olympiad.
• A book named Countdown by Steve Olson tells the story of the United States team's success in the 2001 Olympiad. ^[102]

See also

• List of International Mathematical Olympiads
• International Mathematics Competition for University Students (IMC)
• International Science Olympiad
• List of mathematics competitions
• Pan-African Mathematics Olympiads
• Junior Science Talent Search Examination
• Art of Problem Solving
• Mathcounts

Notes

1. IMO 2021 was originally to be held in Washington D.C., US, but the US was forced to give up hosting soon after the start of the COVID-19 pandemic, which caused funding problems. Russia agreed to host for the second time in a row. ^[63]
2. The originally determined location for hosting IMO 2024 was Ukraine. Due to the recent conflicts between the country and Russia, the location was changed to Bath, in which IMO 2019 was hosted. ^[68]
3. The Soviet Union participated the IMO for the last time in 1991 due to the Dissolution of the Soviet Union. From 1992, former Soviet countries – including Russia – entered separately. ^[29]

Citations

1. "International Mathematics Olympiad (IMO)". 1 February 2008.
2. "Geoff Smith (August 2017). "UK IMO team leader's report". University of Bath" (PDF). Retrieved 2 July 2018.
3. "The International Mathematical Olympiad 2001 Presented by the Akamai Foundation Opens Today in Washington, D.C." Retrieved 5 March 2008.
4. Tony Gardiner (21 July 1992). "33rd International Mathematical Olympiad". University of Birmingham. Retrieved 5 March 2008.
5. "The International Mathematical Olympiad" (PDF). AMC. Archived from the original (PDF) on 16 February 2008. Retrieved 5 March 2008.
6. Turner, Nura D. (1985). "A Historical Sketch of Olympiads: U.S.A. and International". The College Mathematics Journal. 16 (5): 330–335. doi:10.1080/07468342.1985.11972906.
7. "Singapore International Mathematical Olympiad (SIMO) Home Page". Singapore Mathematical Society. Archived from the original on 27 March 2003. Retrieved 4 February 2008.
8. "Norwegian Students in International Mathematical Olympiad". Archived from the original on 20 October 2006. Retrieved 5 March 2008.
9. ( Lord 2001 )
10. Law, Ka-Ho (2015). "IMO 2015 Report Leader's Perspective (I)" (PDF). IMOment: IMO 2016 Newsletter. No. 5. p. 4.
11. ( Olson 2004 )
12. ( Djukić 2006 )
13. "IMO Facts from Wolfram". Archived from the original on 29 February 2012. Retrieved 5 March 2008.
14. ( Liu 1998 )
15. Chen, Wang. Personal interview. February 19, 2008.
16. "The American Mathematics Competitions". Archived from the original on 2 March 2008. Retrieved 5 March 2008.
17. David C. Hunt. "IMO 1997". Australian Mathematical Society. Archived from the original on 16 September 2009. Retrieved 5 March 2008.
18. "How Medals Are Determined". Archived from the original on 1 January 2018. Retrieved 5 March 2008.
19. "IMO '95 regulations" . Retrieved 5 March 2008.
20. "51st International Mathematical Olympiad Results". Archived from the original on 29 June 2011. Retrieved 25 July 2011.
21. "52nd IMO 2011 – Individual results". International Mathematical Olympiad. Retrieved 17 July 2022.
22. "53rd IMO 2012 – Individual results". International Mathematical Olympiad. Retrieved 17 July 2022.
23. Woodrow, Robert E. (1991). "The Olympiad corner No.129" (PDF). Crux Mathematicorum . 17 (9): 257. Retrieved 24 September 2023.
24. "International Mathematical Olympiad: Democratic People's Republic of Korea" . Retrieved 17 July 2010.
25. Geoff Smith. "International Mathematical Olympiad 2010 UK leader's report, Almaty and Astana, Kazakhstan". UK IMO Register. Retrieved 6 September 2023.
26. "North Korea's disqualification at IMO 2010". Art of Problem Solving. Retrieved 6 September 2023.
27. Adam McBride. "34th International Mathematical Olympiad, Istanbul, Turkey, UK leader's report". UK IMO Register. Retrieved 24 November 2023.
28. "International Mathematical Olympiad". 31 March 2022. Archived from the original on 31 March 2022. Retrieved 16 December 2023.
29. "Ranking of countries". International Mathematical Olympiad. Retrieved 20 June 2011.
30. "1st IMO 1959". International Mathematical Olympiad. Retrieved 17 July 2022.
31. "Historical Record of US Teams". Mathematical Association of America. Archived from the original on 28 November 2009. Retrieved 19 June 2011.
32. Unofficial events were held in Finland and Luxembourg in 1980. "UK IMO register". IMO register. Retrieved 17 June 2011.
33. "IMO 1995". Canadian Mathematical Society. Archived from the original on 29 February 2008. Retrieved 17 March 2008.
34. "IMO 1996". Canadian Mathematical Society. Archived from the original on 23 February 2008. Retrieved 17 March 2008.
35. "IMO 1997" (in Spanish). Argentina. Retrieved 17 March 2008.
36. "IMO 1998". Republic of China. Archived from the original on 5 December 1998.
37. "IMO 1999". Canadian Mathematical Society. Archived from the original on 23 February 2008. Retrieved 17 March 2008.
38. "IMO 2000". Wolfram. Retrieved 17 March 2008.
39. "IMO 2001". Canadian Mathematical Society. Archived from the original on 18 May 2011. Retrieved 17 March 2008.
40. Andreescu, Titu (2004). USA & International Mathematical Olympiads 2002. Mathematical Association of America. ISBN   978-0-88385-815-8.
41. "IMO 2003". Japan. Archived from the original on 6 March 2008. Retrieved 17 March 2008.
42. "IMO 2004". Greece. Archived from the original on 27 June 2004.
43. "IMO 2005". Mexico. Archived from the original on 11 July 2005.
44. "IMO 2006". Slovenia. Archived from the original on 28 February 2009. Retrieved 17 March 2008.
45. "IMO 2007". Vietnam. Archived from the original on 12 February 2009. Retrieved 17 March 2008.
46. "IMO 2008". Spain. Archived from the original on 26 February 2008. Retrieved 17 March 2008.
47. "IMO 2009" (in German). Germany. Retrieved 17 March 2008.
48. "51st IMO 2010". IMO. Retrieved 22 July 2011.
49. "52nd IMO 2011". IMO. Retrieved 22 July 2011.
50. "53rd IMO 2012". IMO. Retrieved 22 July 2011.
51. "54th International Mathematical Olympiad". Universidad Antonio Nariño. Archived from the original on 21 January 2013. Retrieved 20 July 2012.
52. "55th IMO 2014". IMO. Retrieved 10 September 2016.
53. "56th IMO 2015". IMO. Retrieved 10 September 2016.
54. "57th IMO 2016". IMO. Retrieved 10 September 2016.
55. "58th IMO 2017". IMO. Retrieved 10 September 2016.
56. "59th IMO 2018". IMO. Retrieved 10 September 2016.
57. "60th IMO 2019". IMO. Retrieved 10 September 2016.
58. Becomes a virtual event due to COVID-19 pandemic.
59. "61st IMO 2020". IMO. Retrieved 10 September 2016.
60. "61st IMO 2020" . Retrieved 25 December 2018.
61. "Annual Regulations for IMO 2020" (PDF). Imo2020.ru. Retrieved 8 November 2021.
62. "62nd IMO 2021 Result Table". Imo-official.org. Retrieved 8 November 2021.
63. "Virtual IMO 2020 – Russia". International Mathematical Olympiad Foundation. 11 July 2020. Retrieved 22 August 2023.
64. "63rd IMO 2022 Result Table". Imo-official.org. Retrieved 14 July 2022.
65. "64th IMO 2023 Result Table". IMO. Retrieved 22 July 2019.
66. "65th IMO 2024". IMO. Retrieved 17 July 2021.
67. "International Mathematical Olympiad 2024". www.imo2024.uk. Archived from the original on 8 June 2022. Retrieved 11 June 2022.
68. "IMO 2024". IMO. Retrieved 12 July 2023.
69. "THE NATION'S NEWEST OLYMPIANS WERE REVEALED TODAY WITH HIGH HOPES FOR MEDALS ON THE INTERNATIONAL STAGE". Australian Maths Trust. Retrieved 11 July 2024.
70. "67th IMO 2026". IMO. Retrieved 11 July 2023.
71. "68th IMO 2027". IMO. Retrieved 7 January 2024.
72. "69th IMO 2028". IMO. Retrieved 25 August 2024.
73. "International Mathematical Olympiad – People's Republic of China – Team Results". www.imo-official.org. Retrieved 12 July 2023.
74. "International Mathematical Olympiad – Russian Federation – Team Results". Imo-official.org. Retrieved 8 November 2021.
75. "International Mathematical Olympiad – Union of Soviet Socialist Republics – Team Results". Imo-official.org. Retrieved 8 November 2021.
76. "International Mathematical Olympiad – United States of America – Team Results". Imo-official.org. Retrieved 8 November 2021.
77. "International Mathematical Olympiad – Hungary – Team Results". Imo-official.org. Retrieved 8 November 2021.
78. "International Mathematical Olympiad – Romania – Team Results". Imo-official.org. Retrieved 8 November 2021.
79. "International Mathematical Olympiad – Germany – Team Results". Imo-official.org. Retrieved 8 November 2021.
80. "International Mathematical Olympiad – Republic of Korea – Team Results". Imo-official.org. Retrieved 8 November 2021.
81. "Results of the 44th International Mathematical Olympiad". Mmjp.or.jp. Archived from the original on 2 May 2008. Retrieved 5 March 2008.
82. "International Mathematical Olympiad – Islamic Republic of Iran – Team Results". Imo-official.org. Retrieved 8 November 2021.
83. "International Mathematical Olympiad – German Democratic Republic – Team Results". Imo-official.org. Retrieved 8 November 2021.
84. "International Mathematical Olympiad – Bulgaria – Team Results". Imo-official.org. Retrieved 8 November 2021.
85. "No. 1 and Counting". Time. 1 August 1994. Retrieved 23 February 2010.
86. "Results: Cumulative Results by Country". Imo-official.org. Retrieved 29 July 2023.
87. "International Mathematical Olympiad Hall of Fame". Imo-official.org. Retrieved 15 July 2015.
88. "IMO Official Record for Zhuo Qun (Alex) Song". Imo-official.org. Retrieved 15 July 2015.
89. MacKenzie, D. (2001). "IMO's Golden Boy Makes Perfection Look Easy". Science. 293 (5530): 597. doi:10.1126/science.293.5530.597. PMID   11474084. S2CID   8587484 . Retrieved 5 March 2008.
90. "International Mathematical Olympiad Hall of Fame" . Retrieved 18 July 2009.
91. "IMO team record". Archived from the original on 20 February 2008. Retrieved 5 March 2008.
92. "The Mathematical Association of America's William Lowell Putnam Competition". Archived from the original on 29 February 2000. Retrieved 5 March 2008.
93. ( Vakil 1997 )
94. "A packed house for a math lecture? Must be Terence Tao". Iht.com. Retrieved 5 March 2008.
95. "Peru won four silver and two bronze medals in International Math Olympiad". Livinginperu.com. 22 July 2009.
96. Whitney, A. K. (18 April 2016). "Why Does the Gender Gap Persist in International Math Competitions?". The Atlantic. Retrieved 15 August 2021.
97. Loewus, Liana (27 July 2015). "Gender Gaps at the Math Olympiad: Where Are the Girls?". Education Week. Retrieved 15 August 2021.
98. Hoyos, Carola (5 September 2019). "The biggest gender divide is in mathematics". Financial Times . Archived from the original on 10 December 2022.
99. "International Mathematical Olympiad". Imo-official.org.
100. "Mathematical ratios: Is a competition just for girls a plus or a minus?". TheGuardian.com . 13 October 2015.
101. Hard Problems: The Road to the World's Toughest Math Contest Archived 2010-07-15 at the Wayback Machine , Zala Films and the Mathematical Association of America, 2008.
102. Olson, Steve (2005). Count Down: Six Kids Vie for Glory at the World's Toughest Math Competition. Houghton Mifflin Harcourt. ISBN   978-0-618-56212-1.

References

• Xu, Jiagu (2012). Lecture Notes on Mathematical Olympiad Courses, For Senior Section. World Scientific Publishing. ISBN   978-981-4368-94-0.
• Xiong, Bin; Lee, Peng Yee (2013). Mathematical Olympiad in China (2009-2010). World Scientific Publishing. ISBN   978-981-4390-21-7.
• Xu, Jiagu (2009). Lecture Notes on Mathematical Olympiad Courses, For Junior Section. World Scientific Publishing. ISBN   978-981-4293-53-2.
• Olson, Steve (2004). Count Down . Houghton Mifflin. ISBN   0-618-25141-3.
• Verhoeff, Tom (August 2002). The 43rd International Mathematical Olympiad: A Reflective Report on IMO 2002 (PDF). Computing Science Report, Vol. 2, No. 11. Faculty of Mathematics and Computing Science, Eindhoven University of Technology.
• Djukić, Dušan (2006). The IMO Compendium: A Collection of Problems Suggested for the International Olympiads, 1959–2004. Springer. ISBN   978-0-387-24299-6.
• Lord, Mary (23 July 2001). "Michael Jordans of math - U.S. Student whizzes stun the cipher world". U.S. News & World Report . 131 (3): 26.
• Saul, Mark (2003). "Mathematics in a Small Place: Notes on the Mathematics of Romania and Bulgaria" (PDF). Notices of the American Mathematical Society . 50: 561–565.
• Vakil, Ravi (1997). A Mathematical Mosaic: Patterns & Problem Solving. Brendan Kelly Publishing. p. 288. ISBN   978-1-895997-28-6.
• Liu, Andy (1998). Chinese Mathematics Competitions and Olympiads. AMT Publishing. ISBN   1-876420-00-6.

External links

• Official IMO web site
• Archive to the IMO 1959–2003 problems and solutions
• Old central IMO web site