Mathematical notation shapes humanity’s ability to efficiently contemplate mathematics. Here’s a cool factoid for you: the symbol + and -, referring to addition and subtraction, first appeared in 1456 in an unpublished manuscript by the mathematician Johann Regiomontanus ( also known as Jahann Müller ).
The plus symbol, as an abbreviation for the Latin et ( and ), was found earlier in a manuscript dated 1417; however, the downward stroke was not quite vertical.
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