# Heinz Hopf

Heinz Hopf
Heinz Hopf (on the right) in Oberwolfach, together with Hellmuth Kneser
Born 19 November 1894
Gräbschen (near Breslau, Imperial Germany; now Wrocław, Poland)
Died 3 June 1971 (aged 76)
Nationality German
Alma mater University of Berlin
Known for Hopf algebra
Hopf bundle
Hopf conjecture
H-space
Hopf–Rinow theorem
Scientific career
Fields Mathematics
Institutions ETH Zürich
Erhard Schmidt
Doctoral students Beno Eckmann
Hans Freudenthal
Werner Gysin
Friedrich Hirzebruch
Heinz Huber
Michel Kervaire
Willi Rinow
Hans Samelson
Ernst Specker
Eduard Stiefel
James J. Stoker

Heinz Hopf (19 November 1894 – 3 June 1971) was a German mathematician who worked on the fields of topology and geometry.[1]

## Early life and education

Hopf was born in Gräbschen, Germany (now Grabiszyn (pl), part of Wrocław, Poland), the son of Elizabeth (née Kirchner) and Wilhelm Hopf. His father was born Jewish and converted to Protestantism a year after Heinz was born; his mother was from a Protestant family.[2][3]

Hopf attended Dr. Karl Mittelhaus' higher boys' school from 1901 to 1904, and then entered the König-Wilhelm-Gymnasium in Breslau. He showed mathematical talent from an early age. In 1913 he entered the Silesian Friedrich Wilhelm University where he attended lectures by Ernst Steinitz, Kneser, Max Dehn, Erhard Schmidt, and Rudolf Sturm. When World War I broke out in 1914, Hopf eagerly enlisted. He was wounded twice and received the iron cross (first class) in 1918.

In 1920, Hopf moved to Berlin to continue his mathematical education. He studied under Ludwig Bieberbach, receiving his doctorate in 1925.

## Career

In his dissertation, Connections between topology and metric of manifolds (German Über Zusammenhänge zwischen Topologie und Metrik von Mannigfaltigkeiten), he proved that any simply connected complete Riemannian 3-manifold of constant sectional curvature is globally isometric to Euclidean, spherical, or hyperbolic space. He also studied the indices of zeros of vector fields on hypersurfaces, and connected their sum to curvature. Some six months later he gave a new proof that the sum of the indices of the zeros of a vector field on a manifold is independent of the choice of vector field and equal to the Euler characteristic of the manifold. This theorem is now called the Poincaré–Hopf theorem.

Hopf spent the year after his doctorate at the University of Göttingen, where David Hilbert, Richard Courant, Carl Runge, and Emmy Noether were working. While there he met Paul Alexandrov and began a lifelong friendship.

In 1926 Hopf moved back to Berlin, where he gave a course in combinatorial topology. He spent the academic year 1927/28 at Princeton University on a Rockefeller fellowship with Alexandrov. Solomon Lefschetz, Oswald Veblen and J. W. Alexander were all at Princeton at the time. At this time Hopf discovered the Hopf invariant of maps ${\displaystyle S^{3}\to S^{2}}$ and proved that the Hopf fibration has invariant 1. In the summer of 1928 Hopf returned to Berlin and began working with Alexandrov, at the suggestion of Courant, on a book on topology. Three volumes were planned, but only one was finished. It was published in 1935.

In 1929, he declined a job offer from Princeton University. In 1931 Hopf took Hermann Weyl's position at ETH, in Zürich. Hopf received another invitation to Princeton in 1940, but he declined it. Two years later, however, he was forced to file for Swiss citizenship after his property was confiscated by Nazis, his father's conversion to Christianity having failed to convince German authorities that he was an "Aryan."

In 1946/47 and 1955/56 Hopf visited the United States, staying at Princeton and giving lectures at New York University and Stanford University. He served as president of the International Mathematical Union from 1955 to 1958.[4]

## Personal life

In October 1928 Hopf married Anja von Mickwitz (1891–1967).

## Honors and awards

He received honorary doctorates from Princeton University, the University of Freiburg, the University of Manchester, the University of Paris, the Free University of Brussels, and the University of Lausanne. He was an Invited Speaker at the International Congress of Mathematicians (ICM) in Zürich in 1932 and a Plenary Speaker at the ICM in Cambridge, Massachusetts in 1950.[5]

In memory of Hopf, ETH Zürich awards the Heinz Hopf Prize for outstanding scientific work in the field of pure mathematics.