From the history of maths
Bernhard Riemann
His 1859 paper on prime numbers, about eight pages long, states the Riemann Hypothesis. It is still unproved.
His geometry of curved space later became the language of Einstein’s general relativity.
Unknown author, Public domain, via Wikimedia Commons
Where you’ll meet Riemann here
Number theoryCalculusGeometry
They turn up beside problems and lessons on these topics.
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P. C. Mahalanobis
He founded the Indian Statistical Institute in Kolkata in 1931.
The Mahalanobis distance measures how unusual a data point is, and is used from banking to biology. His birthday, 29 June, is India’s National Statistics Day.
Unknown author, Public domain, via Wikimedia Commons