Mathematician known for the constant "e" (2.71828) (5)

I believe the answer is:

euler

(Other definitions for euler that I've seen before include "See fifty three across" , "Leonhard -, C-eighteen Swiss mathematician" , "18th-century Swiss mathematician and physicist" , "Leonhard -----, founder of mathematical analysis" , "Leonhard -, Eighteenth century Swiss mathematician" .)

I've seen this clue in The New York Times.

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