Heinrich Tietze

was born 137 years ago

31st August 1880

**Heinrich Tietze** was an Austrian mathematician, known for the Tietze extension theorem. He also developed the Tietze transformations for group presentations, and was the first to pose the group isomorphism problem.

*Find out more at*:

http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Tietze.html