Johannes Widmann

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Johannes Widmann (born c. 1460 in Eger; died after 1498 in Leipzig) was a German mathematician who invented the addition (+) and the subtraction (-) signs.[1] Widmann attended the University of Leipzig in the 1480s, and published Behende und hubsche Rechenung auff allen Kauffmanschafft, his work making use of the signs, in Leipzig in 1489.[1]

[edit] References

  1. ^ a b Helle, Matthias. Johannes Widmann. FU-Berlin.de. Free University of Berlin. Retrieved on 2007-09-10.
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