Ivan Petrovsky

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Science and technology

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What Wikipedia says

Ivan Georgiyevich Petrovsky (Russian: Иван Георгиевич Петровский; 18 January 1901 – 15 January 1973) was a Soviet mathematician working mainly in the field of partial differential equations. He greatly contributed to the solution of Hilbert's 19th and 16th problems, and discovered what are now called Petrovsky lacunas.

Excerpt from the Wikipedia article “Ivan Petrovsky”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Министерство связи СССР. Рис. Е. Анискина., Public domain, via Wikimedia Commons.