Karl Theodor Wilhelm Weierstrass (German: Weierstraß) (1815 - 1897) was a German mathematician who was a central figure in the development of mathematical analysis. The Weierstrass M-test, Weiestrass approximation theorem, and Weierstrass function are named after him.IPA:
[kaːɐ̯l ˈtʰeːodoɐ̯ ˈvɪlhɛlm 'vaɪɐ̯ˌʃtʁas]
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(Special thanks to participants of this thread for helping me with the phonetic)