Abstract
SummaryThere is much confusion in the literature about the meaning of zw, where z and w are complex numbers with . For example, we are often told that (a number), but that ii is an infinite set. So which of these is true? Is zw a set or a number? It cannot be both, and here we suggest how the inconsistent use of the universal notation zw can be clarified and resolved by using elementary group theory.
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