Category Combinatorics

Fekete’s Lemma and an application on Ramsey theory

Fekete’s lemma was proved by Pólya and Szegő. A historical note, not related to Fekete’s lemma thought, which I did not know myself before reading the biography of Szegő and I find it for some reason interesting to know: At the age of 15, the young John von Neumann, recognised as a mathematical prodigy, was […]

Quantifying confusion

When a European goes to USA or when a US citizen goes to Europe, he or she may be confused by the different way a date is written down. Specifically, the day “7th November 2011”  is written in USA as 11/7/2011 which is the day of 11th of July in Europe. Well, imagine that you […]