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.:

  $$a+b:=\text{ the sum of }a\text{ and }b$$

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

  $$+a:=a\text{ (for all }a)$$

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