The plus sign comes from the abbreviation of the Latin word "et" meaning "and". There were recorded more than 100 abbreviations for "et" before Johann Widman put + in print for the first time in 1489. pic.twitter.com/tX5oc9jQn3

— Fermat's Library (@fermatslibrary) November 15, 2020

Erdős published more than 1500 papers
• The most number of publications in one year was in 1978 at 65 when he published 49 papers
• He published 118 papers after 80 pic.twitter.com/ln45yUHsin

— Fermat's Library (@fermatslibrary) November 13, 2020

Integral representation of n factorial (Euler, 1729) pic.twitter.com/wOrNDZE5G8

— Tamás Görbe (@TamasGorbe) July 10, 2020

In 1775, Lagrange introduced these compact forms to describe the area of the triangle or the volume of the tetrahedron. pic.twitter.com/tMwseDN4AS

— Fermat's Library (@fermatslibrary) November 12, 2020