Old Multiplication article:
For every assortment (unique or otherwise) of numbers there is a unique number called the product. Any two numbers in such an assortment can be replaced with their product without effecting any change in the product of the assortment. Any number of ones can be added or removed with no change in the product. Assortments with products other than zero contain only numbers other than zero.
The word multiplication also is used to refer to reproduction.
"Any two numbers in such an assortment can be replaced with their product without effecting any change in the product of the assortment."
This isn't a property of multiplication. This is a property of algebra that states for B = A, B can be substituted for A in any expression without effecting the value of the expression.
The note on reproduction should probably be re-added, though.--BlackGriffen