Heinz Hopf
died 46 years ago
3rd June 1971

Heinz Hopf's work was in algebraic topology. He studied vector fields and extended Lefschetz's fixed point formula. He also studied homotopy classes and defined what is now known as the 'Hopf invariant'.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Hopf.html