Mathematicians Of The Day

20th April

On this day in 1543, Copernicus's work De revolutionibus orbium coelestium was published when Rheticus autographed a presentation copy of the completed work. Copernicus died a month later.

On this day in 2009 Google released a Zu Chongzhi doodle.

Click on for a poster.

Quotation of the day

From Giuseppe Peano
Questions that pertain to the foundations of mathematics, although treated by many in recent times, still lack a satisfactory solution. Ambiguity of language is philosophy's main source of problems. That is why it is of the utmost importance to examine attentively the very words we use.
Opening of the paper Arithmetices principia in which he introduced axioms for the integers.