Mathematician often seen as the founder of topology (5)

I believe the answer is:

euler

(Other definitions for euler that I've seen before include "Leonhard -, C-eighteen Swiss mathematician" , "Leonhard -----, founder of mathematical analysis" , "calculating foreigner" , "Swiss mathematician; sounds like lubricator" , "Eighteen-hole game" .)

I've seen this clue in The Times and The Sunday Times.

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