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==Mathematics== * First known use of the term ''[[Abscissa]]'', by [[Stefano degli Angeli]].<ref>According to [[Moritz Cantor]]. {{cite web|url=http://jeff560.tripod.com/a.html|title=Earliest Known Uses of Some of the Words of Mathematics (A)|work=Jeff Miller Web Pages|date=2010-11-14|accessdate=2011-04-24}}</ref> * [[Swiss people|Swiss]] mathematician [[Johann Rahn]] publishes ''Teutsche Algebra,'' containing the first printed use of the '[[division sign]]' (Γ·, a repurposed [[obelus]] variant) as a mathematical symbol for [[division (mathematics)|division]] and of the '[[therefore sign]]' (β΄).
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