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Enriched categories, topoi, abelian categories, monoidal categories, homological algebra.

3 votes

"Linked List" puzzle

One can get the same series in a subtraction- and division-free way by iterating the first equation, $L = 1+AL = 1 + A + AAL = 1 + A + AA + AAL = \dots$. This derivation may "live" in a more modest …
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