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Jun 29, 2022 at 3:13 comment added Michael Hardy I originally learned this as the DEFINITION of multiplication of complex numbers, so when I encountered it presented as a theorem, I found it puzzling and wondered what the difference was between the theorem and the definition.
S Apr 12, 2015 at 11:41 history answered Benoît Kloeckner CC BY-SA 3.0
S Apr 12, 2015 at 11:41 history made wiki Post Made Community Wiki by Benoît Kloeckner