About Johannes Widmann
https://en.wikipedia.org/wiki/Johannes_Widmann
Johannes Widmann (c. 1460 – after 1498) was a German mathematician. The + and - symbols first appeared in print in his book Mercantile Arithmetic or Behende und hüpsche Rechenung auff allen Kauffmanschafft published in Leipzig in 1489 in reference to surpluses and deficits in business problems.
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Johannes Widmann's Timeline
| 1462 |
1462
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Cheb, Cheb District, Karlovy Vary Region, Czechia (Czech Republic)
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| 1498 |
1498
Age 36
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Leipzig, Leipzig, SN, Germany
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