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plus sign
There are two main uses of the plus sign “$+$” (which is a simplified form of “&”) in the mathematics and the applying sciences:

The original use is as the sign for the binary operation addition of numbers and other elements of rings and algebras, vectors, etc.:
$a\!+\!b\;:=\mbox{\, the sum of\, }a\mbox{\, and\, }b$
Related:
Sum, SumOfSeries, SignumFunction, OppositeNumber, ProductOfNegativeNumbers
Synonym:
plus
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Definition
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