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**William Richard Maximilian Hugo Threlfall** (25 June 1888 Dresden – 4 April 1949 Oberwolfach) was a German mathematician who worked on algebraic topology. He was a coauthor of the standard textbook Lehrbuch der Topologie.

**Dresden** is the capital city of the German state of Saxony, and with around 550,000 inhabitants, it is the state's second most populous city after Leipzig. It is the 12th most populous city of Germany, the fourth largest by area after Berlin, Hamburg and Cologne, as well as the third most populous city in the area of former East Germany, after (East) Berlin and Leipzig. Dresden is contiguous with Freital, Pirna, Radebeul, Meissen and Coswig, and its urban area has around 780,000 inhabitants, making it the largest in Saxony.

**Oberwolfach** is a town in the district of Ortenau in Baden-Württemberg, Germany. It is the site of the Mathematical Research Institute of Oberwolfach, or Mathematisches Forschungsinstitut Oberwolfach.

**Germany**, officially the **Federal Republic of Germany** is a country in Central and Western Europe, lying between the Baltic and North Seas to the north and the Alps, Lake Constance and the High Rhine to the south. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, France to the southwest, and Luxembourg, Belgium and the Netherlands to the west.

- Threlfall, W. (1932), "Gruppenbilder" (PDF),
*Abh. Math.-Phys. Kl. Sächs. Akad. Wiss.*, Leipzig: Hirzel,**41**: 1–59 - Seifert, Threlfall:
*Lehrbuch der Topologie*, Teubner 1934 - Seifert, Threlfall:
*Variationsrechnung im Großen*, Teubner 1938

In mathematics, * Lehrbuch der Topologie* is a book by Herbert Seifert and William Threlfall, first published in 1934 and published in an English translation in 1980. It was one of the earliest textbooks on algebraic topology, and was the standard reference on this topic for many years.

**Alfred Hermann Fried** was an Austrian Jewish pacifist, publicist, journalist, co-founder of the German peace movement, and winner of the Nobel Prize for Peace in 1911.

**Herbert Karl Johannes Seifert** was a German mathematician known for his work in topology.

**Arthur Moritz Schoenflies**, sometimes written as Schönflies, was a German mathematician, known for his contributions to the application of group theory to crystallography, and for work in topology.

**Gustav Adolf Feodor Wilhelm Ludwig Mie** was a German physicist.

**Hieronymus Georg Zeuthen** was a Danish mathematician.

**Rudolf Seeliger** was a German physicist who specialized in electric discharges in gases and plasma physics.

**Leo Königsberger** was a German mathematician, and historian of science. He is best known for his three-volume biography of Hermann von Helmholtz, which remains the standard reference on the subject.

**Ernst Steinitz** was a German mathematician.

**William Fogg Osgood** was an American mathematician, born in Boston.

**Egbert Rudolf van Kampen** was a Dutch mathematician. He made important contributions to topology, especially to the study of fundamental groups.

**Eugen Otto Erwin Netto** was a German mathematician. He was born in Halle and died in Giessen.

**Christian Georg Theodor Ruete** was a German ophthalmologist born in Scharmbeck, Lower Saxony.

The **Faculty of Mathematics and Computer Science** is one of twelve faculties at the University of Heidelberg. It comprises the Institute of Mathematics, the Institute of Applied Mathematics, the School of Applied Sciences, and the Institute of Computer Science. The faculty maintains close relationships to the Interdisciplinary Center for Scientific Computing (IWR) and the Mathematics Center Heidelberg (MATCH). The first chair of mathematics was entrusted to the physician Jacob Curio in the year 1547.

**Harro Heuser** was a German mathematician. In German-speaking countries he is best known for his popular two-volume introduction into real analysis, *Lehrbuch der Analysis*.

**Niels Nielsen** was a Danish mathematician who specialized in mathematical analysis.

**Ludwig Christian Wiener** was a German mathematician who specialized in descriptive geometry. Wiener was also a physicist and philosopher. In 1863, he was the first person to identify qualitatively the internal molecular cause of Brownian motion.

**Friedrich Heinrich Schur** was a German mathematician who studied geometry.

**Horst Schubert** was a German mathematician.

**Adam Wilhelm Siegmund Günther** was a German geographer, mathematician, historian of mathematics and natural scientist.

- Gabriele Dörflinger: William R. M. H. Threlfall
- William Threlfall at the Mathematics Genealogy Project

The **Mathematics Genealogy Project** is a web-based database for the academic genealogy of mathematicians. By 13 February 2019, it contained information on 238,725 mathematical scientists who contributed to research-level mathematics. For a typical mathematician, the project entry includes graduation year, thesis title, *alma mater*, doctoral advisor, and doctoral students.

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