Crossword Genius

Swiss mathematician (5)

Ross

I believe the answer is:

euler

'swiss mathematician' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for euler that I've seen before include "Leonhard --, C18 Swiss mathematician" , "Leonhard -, C-eighteen Swiss mathematician" , "Leonhard -----, founder of mathematical analysis" , "calculating foreigner" , "Swiss scientist" .)

I've seen this clue in the Penny Press and The Times.
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