Hans Hahn
died 80 years ago
24th July 1934

Hans Hahn was a pioneer in set theory and functional analysis and is best remembered for the Hahn-Banach theorem. He also made important contributions to the calculus of variations, developing ideas of Weierstrass.

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