Calendrical pareidolia

This article lists calendrical coincidences: events such as births and deaths, occurring on the same day in the calendar but otherwise coincidental, and yet of interest.

Calendar

June

June 24

Theme: Four color theorem.

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  1880: Mathematician and academic Oswald Veblen born. His work will find application in atomic physics and the theory of relativity. Veblen will publish a paper (1912) on the Four color conjecture.

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  2008: Mathematician and academic Gerhard Ringel dies. Ringel was a pioneer of graph theory and contributed significantly to the proof of the Heawood conjecture (now the Ringel-Youngs theorem), a mathematical problem closely linked with the Four color theorem.

Full June 24 page

Fiction cross-reference

• Calendrical Coincidences
• Gnomon algorithm
• Gnomon Chronicles

Nonfiction cross-reference

• Days of the year (nonfiction)