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**Johannes Acronius** (or **Atrocianus**) **Frisius** (1520 – 18 October 1564) was a Dutch doctor and mathematician of the 16th century.

The **Netherlands**, informally **Holland**, is a country in Northwestern Europe with some overseas territories in the Caribbean. In Europe, it consists of 12 provinces that border Germany to the east, Belgium to the south, and the North Sea to the northwest, with maritime borders in the North Sea with those countries and the United Kingdom. Together with three island territories in the Caribbean Sea—Bonaire, Sint Eustatius and Saba—it forms a constituent country of the Kingdom of the Netherlands. The official language is Dutch, but a secondary official language in the province of Friesland is West Frisian. In the northern parts of the country, Low German is also spoken.

A **physician**, **medical practitioner**, **medical doctor**, or simply **doctor**, is a professional who practises medicine, which is concerned with promoting, maintaining, or restoring health through the study, diagnosis, prognosis and treatment of disease, injury, and other physical and mental impairments. Physicians may focus their practice on certain disease categories, types of patients, and methods of treatment—known as specialities—or they may assume responsibility for the provision of continuing and comprehensive medical care to individuals, families, and communities—known as general practice. Medical practice properly requires both a detailed knowledge of the academic disciplines, such as anatomy and physiology, underlying diseases and their treatment—the *science* of medicine—and also a decent competence in its applied practice—the art or *craft* of medicine.

A **mathematician** is someone who uses an extensive knowledge of mathematics in his or her work, typically to solve mathematical problems.

He was named after his city of birth, Akkrum in Friesland. From 1547 he worked as professor of mathematics in Basel, then after 1549 as professor of logic, and in 1564 of medicine. He died from the plague in the same year. Apart from mathematical and scientific works, he wrote Latin poetry and humanist tracts.

**Akkrum** is a village in the Dutch province of Friesland. It is located in the municipality Heerenveen, about 17 km south of the city of Leeuwarden.

**Friesland**, historically known as **Frisia**, is a province of the Netherlands located in the northern part of the country. It is situated west of Groningen, northwest of Drenthe and Overijssel, north of Flevoland, northeast of North Holland, and south of the Wadden Sea. In 2019, the province had a population of 647,672 and a total area of 5,749 km^{2} (2,220 sq mi).

**Professor** is an academic rank at universities and other post-secondary education and research institutions in most countries. Literally, *professor* derives from Latin as a "person who professes" being usually an expert in arts or sciences, a teacher of the highest rank.

*De motu terrae**De sphaera**De astrolabio et annuli astronomici confectione**Cronicon und Prognosticon astronomica*, manuscript- biography and 45 aphorisms of the anabaptist David Joris.

An **aphorism** is a concise, terse, laconic, and/or memorable expression of a general truth or principle. They are often handed down by tradition from generation to generation. The concept is distinct from those of an adage, brocard, chiasmus, epigram, maxim, principle, proverb, and saying; some of these concepts are species of aphorism.

**David Joris** was an important Anabaptist leader in the Netherlands before 1540.

Baron **Augustin-Louis Cauchy** was a French mathematician, engineer, and physicist who made pioneering contributions to several branches of mathematics, including mathematical analysis and continuum mechanics. He was one of the first to state and rigorously prove theorems of calculus, rejecting the heuristic principle of the generality of algebra of earlier authors. He almost singlehandedly founded complex analysis and the study of permutation groups in abstract algebra.

**Aleksandr Mikhailovich Lyapunov** was a Russian mathematician, mechanician and physicist. His surname is sometimes romanized as **Ljapunov**, **Liapunov**, **Liapounoff** or **Ljapunow**. He was the son of astronomer Mikhail Lyapunov and the brother of pianist and composer Sergei Lyapunov.

**James Joseph Sylvester** FRS HFRSE was an English mathematician. He made fundamental contributions to matrix theory, invariant theory, number theory, partition theory, and combinatorics. He played a leadership role in American mathematics in the later half of the 19th century as a professor at the Johns Hopkins University and as founder of the *American Journal of Mathematics*. At his death, he was a professor at Oxford.

**Johann Bernoulli** was a Swiss mathematician and was one of the many prominent mathematicians in the Bernoulli family. He is known for his contributions to infinitesimal calculus and educating Leonhard Euler in the pupil's youth.

The **University of Padua** is an Italian university located in the city of Padua, Veneto, Italy. The University of Padua was founded in 1222 as a school of law. Padua is the second-oldest university in Italy and the world's fifth-oldest surviving university. In 2010 the university had approximately 65,000 students, in 2016 was ranked "best university" among Italian institutions of higher education with more than 40,000 students, and in 2018 best Italian university according to ARWU ranking.

**Alberto Pedro Calderón** was an Argentinian mathematician. His name is associated with the University of Buenos Aires, but first and foremost with the University of Chicago, where Calderón and his mentor, the analyst Antoni Zygmund, developed the theory of singular integral operators. This created the "Chicago School of (hard) Analysis".

**Spiru C. Haret** was a Romanian mathematician, astronomer and politician. He made a fundamental contribution to the *n*-body problem in celestial mechanics by proving that using a third degree approximation for the disturbing forces implies instability of the major axes of the orbits, and by introducing the concept of *secular perturbations* in relation to this.

**Carl-Wilhelm Reinhold de Boor** is a German-American mathematician and professor emeritus at the University of Wisconsin–Madison.

**Conrad Dasypodius** was a professor of mathematics in Strasbourg, Alsace. He was born in Frauenfeld, Thurgau, Switzerland. His first name was also rendered as **Konrad** or **Conradus** or **Cunradus**, and his last name has been alternatively stated as **Rauchfuss**, **Rauchfuß**, and **Hasenfratz**. He was the son of Petrus Dasypodius, a humanist and lexicographer.

**Robert Beaumont** was Master of Trinity College Cambridge from 1561 to 1567 and twice Vice-Chancellor of the University of Cambridge. During this time, he commissioned Hans Eworth to copy the 1537 Hans Holbein portrait of King Henry VIII. This copy was bequeathed to Trinity College where it hangs to this day.

**Ngô Bảo Châu** is a Vietnamese-French mathematician at the University of Chicago, best known for proving the fundamental lemma for automorphic forms proposed by Robert Langlands and Diana Shelstad. He is the first Vietnamese national to have received the Fields Medal.

**Cyprián Karásek Lvovický ** was a Bohemian astronomer, mathematician and astrologer.

**Nicolaus Mulerius** was a professor of medicine and mathematics at the University of Groningen.

**Martinus Smiglecius** was a Polish Jesuit philosopher and logician, known for his erudite scholastic *Logica*.

**García Álvarez de Toledo y Osorio, 4th Marquis of Villafranca del Bierzo**, was a Spanish general and politician.

**Martin Borrhaus** was a German Protestant theologian and reformer.

**Peter Scholze** is a German mathematician known for his work in algebraic geometry. He has been a professor at the University of Bonn since 2012, and director at the Max Planck Institute for Mathematics since 2018. He has been called one of the leading mathematicians in the world. He won the Fields Medal in 2018, which is regarded as the highest professional honor in mathematics.

**Michiel Hazewinkel** is a Dutch mathematician, and Emeritus Professor of Mathematics at the Centre for Mathematics and Computer and the University of Amsterdam, particularly known for his 1978 book *Formal groups and applications* and as editor of the *Encyclopedia of Mathematics*.

**Mikołaj z Szadka Prokopowicz** (1489-1564) was a Polish academic.

**Johann Lantz** or **Lanz** was a German mathematician and jesuit.

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