The Happy End Problem
摘要
During the winter of 1932–1933, two young friends, mathematics student Paul (Pál) Erdős, aged 19, and chemistry student George (György) Szekeres, 21, solved the problem posed by their young lady friend Esther Klein, 22, but did not send it to a journal for a year and a half. When Erdős finally sent this joint paper for publication, he chose J. E. L. Brouwer’s journal Compositio Mathematica, where it appeared in 1935 [ES1].