Number - Multiplication (Product)

1 - About

Multiplication is denoted by:

  • the cross symbol × (\times in Latex),
  • by a point ·
  • or by the absence of symbol

It's a binary function.

3 - Properties

Multiplication is:

  • Associative: <math>\alpha(\beta.v) = (\alpha.\beta)v</math>
  • (Function|Operator) - Commutative property (Order doesn’t matter)

4 - Rules for handling the signed quantities

By: Rafael Bombelli in his Algebra (1572)

  • Plus times plus makes plus
  • Minus times minus makes plus
  • Plus times minus makes minus
  • Minus times plus makes minus.

5 - Documentation / Reference


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