I understand that (R*, x) (under multiplication) is a group, where R* is the real numbers excluding 0.
It has an identity element (1)
Has an inverse (1/x for all x in the group)
but I am unsure how to prove its associativity.
2026-03-27 01:44:55.1774575895
How to prove that (R*, x) is associative?
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