Which identity is #y3=3y#?

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Answer 1 · 2015-06-17T09:21:21

Commutativity of multiplication

#a*b = b*a# for all #a, b in RR#

Both addition and multiplication are (normally) commutative.

There are some strange number systems in which multiplication is not always commutative (quaternions).

Which identity is #y*3=3*y#?