Happy Birthday to Bertrand Russell … May 18, 1872.

“In a long and varied career Russell published a vast number of books on logic, theory of knowledge, and many other topics. His best known work was Principia Mathematica.”

mathshistory.st-andrews.ac.uk/Biographies/...

Happy Birthday to Richard Feynman … May, 11 1918.

A physicist known for his work in the path integral formulation of quantum mechanics, quantum electrodynamics, the physics of superfluidity & particle physics. Feynman received the Nobel Prize in Physics in 1965.

en.m.wikipedia.org/wiki/Richard...

Happy (belated) Birthday to Sophie Germain April 1, 1776 …

“Germain made a major contributions to number theory (in particular, the theory of primes), acoustics and elasticity.”

The stamp from France 2014 celebrates her 240th birthday.

mathshistory.st-andrews.ac.uk/Biographies/...

Happy Birthday to Stefan Banach … March 30, 1892.

“Banach founded modern functional analysis and made major contributions to the theory of topological vector spaces. In addition, he contributed to measure theory, integration, and orthogonal series.”

mathshistory.st-andrews.ac.uk/Biographies/...

Happy Belated Birthday to Ulugh Beg … March 22, 1393.

“Beg was a mathematician and astronomer. He founded an important centre for study at Samarkand staffed with the best scientists of the time. He did important early work on trigonometry.”

mathshistory.st-andrews.ac.uk/Biographies/...

Happy Birthday Pierre-Simon Laplace … March 23, 1749.

“Laplace proved the stability of the solar system. In analysis he introduced the potential function & Laplace coefficients. He also put the theory of mathematical probability on a sound footing.”

mathshistory.st-andrews.ac.uk/Biographies/...

March 21, 1685 … the birthday of Johann Sebastian Bach … the mathematician’s composer!

Happy Birthday to this guy … and Happy Pi Day!

On March 9, 1736 ... "Euler received a letter from the mayor of Danzig (now Gdansk in Poland) challenging him to solve the Königsburg Bridge Problem."

This postcard from South Korea 2014 celebrates the famous problem.

In honor of International Women's Day, here are three stamps celebrating Sofia Kovalevskaya, Marie Curie and Florence Nightingale.

Happy Birthday Laurent Schwartz (1915 - 2020) …

From MacTutor … “Schwartz was a French mathematician who is best known for his work in the theory of distributions.” He won the Fields Medal for this work in 1950.

Complete Biography … mathshistory.st-andrews.ac.uk/Biographies/...

Wikipedia - “In 1939 he wrote the letter for Albert Einstein's signature that resulted in the Manhattan Project. In 1944 wrote the Szilard petition asking President Truman to demonstrate the bomb without dropping it on civilians.”

ahf.nuclearmuseum.org/ahf/key-docu...

Leo Szilárd (1898 - 1964) …

Stamp - Hungary 1998 MNH, celebrating the 100th anniversary of his birth.

Wikipedia - “Szilárd was a Hungarian-born physicist/biologist & inventor who made numerous important discoveries in nuclear physics & biology. He conceived the nuclear chain reaction in 1933.”

On this Presidents Day, we celebrate the only US president to ever publish a mathematical proof … President Garfield and his proof of the Pythagorean Theorem.

Details: maa.org/press/period...

Celebrating Georg Cantor …

Stamp - Ukraine 2019 MNH

From MacTutor - "Cantor can be considered as the founder of set theory & introduced the concept of infinite numbers with his discovery of cardinal numbers."

Complete Biography - mathshistory.st-andrews.ac.uk/Biographies/...

#philately

My favorite stamp celebrating the legendary Paul Erdös …

From MacTutor - "Erdös posed and solved problems in number theory and other areas and founded the field of discrete mathematics."

Complete biography - mathshistory.st-andrews.ac.uk/Biographies/...