- #1

Math Amateur

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MHB

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I need help in order to fully understand the proof of Lemma 0.7 ...

Lemma 0.7 and its proof read as follows:View attachment 8333In the above proof by Leinster we read the following:

" ... ... So by the uniqueness part of the universal property of b ... ... "My question is ... isn't this assuming what we are trying to prove ... that is that b is essentially unique ...Help will be appreciated ...

Peter