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

4 votes

A “mother of all groups”? What kind of structures have "mother of all"s?

For finitely presented simple groups, there are the existentially closed groups. These groups are groups $M$ for which any equation or inequality definable over $M$ has a solution in $M$. These have m …
Carl-Fredrik Nyberg Brodda's user avatar