# Math 21a Summer 2020

## Multivariable Calculus

# Polya on Guessing

**George Polya (1887 - 1985)**taught from 1914 to 1940 at ETH Zürich and from 1940 to 1953 at Stanford University. He found and proved many theorems and wrote many books. Source: Wikipedia. The lecture he gave here shows also a great talent in teaching. We looked at that problem in our June 22, 2020 lecture: in how many parts can one maximally divide space with 4 planes? One can learn a lot about problem solving techniques from this problem.