October 28

Are You Sure ...

• ... that mathematician and academic Gerhard Ringel was a pioneer of graph theory, and that Ringel contributed to the proof of the Heawood conjecture (later the Ringel-Youngs theorem), a mathematical problem closely linked with the Four color theorem?

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Screenshot: Are You Sure (October 28, 2020)

On This Day in History and Fiction

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  1703: Mathematician and engineer Antoine Deparcieux born. He will make a living manufacturing sundials.

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  1841: Chemist and academic Johan August Arfwedson dies. Arfwedson discovered the element lithium in 1817 by isolating it as a salt.

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  1892: Charles-Émile Reynaud performs the first of his Pantomimes Lumineuses shows in Paris using his animated film projection system, the praxinoscope.

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  1919: Mathematician and academic Gerhard Ringel born. Ringel will be a pioneer of graph theory and contribute significantly to the proof of the Heawood conjecture (later the Ringel-Youngs theorem), a mathematical problem closely linked with the Four color theorem.

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  2005: Chemist and academic Richard Smalley dies. Along with colleagues Robert Curl and Harold Kroto, he was awarded the 1996 Nobel Prize in Chemistry for the discovery of a new form of carbon, buckminsterfullerene, also known as buckyballs.