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.

Articles Related

Properties

Multiplication is:

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

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.

Documentation / Reference

• wiki/Multiplication