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.
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Properties
Multiplication is:
- Associative: <math>\alpha(\beta.v) = (\alpha.\beta)v</math>
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.