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 operationMathworldPlanetmath additionPlanetmathPlanetmath of numbers and other elements of rings and algebras, vectors, etc.:

    a+b:= the sum of a and b
  • There is also a special use for the unary operation identity mapping concerning numbers and other ring elements:

    +a:=a (for all a)
Title plus sign
Canonical name PlusSign
Date of creation 2013-03-22 17:35:43
Last modified on 2013-03-22 17:35:43
Owner pahio (2872)
Last modified by pahio (2872)
Numerical id 5
Author pahio (2872)
Entry type Definition
Classification msc 00A06
Classification msc 00A05
Synonym plus
Related topic Sum
Related topic SumOfSeries
Related topic SignumFunction
Related topic OppositeNumber
Related topic ProductOfNegativeNumbers