Mathematician:Karl Theodor Wilhelm Weierstrass

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German mathematician whose main work concerned the rigorous foundations of calculus.

Known as "the father of modern analysis".

Champion beer-drinker and expert fencer.




  • Born: 31 Oct 1815, Ostenfelde, Westphalia (now Germany)
  • Died: 19 Feb 1897, Berlin, Germany


Theorems and Definitions

Results named for Karl Theodor Wilhelm Weierstrass can be found here.

Definitions of concepts named for Karl Theodor Wilhelm Weierstrass can be found here.


  • 1854: Zur Theorie der Abelschen Funktionen (J. reine angew. Math. Vol. 47: 289 – 306)
  • 1856: Theorie der Abelschen Funktionen
  • 1894: Abhandlungen-1
  • 1897: Abhandlungen-2
  • 1902: Vorl. ueber die Theorie der Abelschen Transcendenten
  • 1915: Abhandlungen-3
  • 1927: Vorl. ueber Variationsrechnung

Notable Quotes

A mathematician who is not also something of a poet will never be a complete mathematician.
-- Quoted in 1937: Eric Temple Bell: Men of Mathematics: They Say: What Say They? : Let Them Say

The infinite emptiness and boredom of those years would have been unendurable without the hard work that made me a recluse -- even if I was rated rather a good fellow by the circle of my friends among the Junkers, lawyers, and young officers of the community ... The present offered nothing worth mentioning, and it was not my custom to speak of the future.

Critical View

You should study with Weierstrass in Berlin; he is the master of us all.
-- Charles Hermite to Gösta Mittag-Leffler