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3 votes
1 answer
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Looking for interesting, natural models of this algebraic theory in which $x^\dagger$ is not always the multiplicative inverse of $x$

It is easy to think up interesting, natural models of the algebraic theory presented as follows, such that in these models, $x^\dagger$ is always the multiplicative inverse of $x$. Question. What ...
26 votes
1 answer
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Important open questions in the field of Tropical geometry

What are some of the important unanswered questions in the field of tropical geometry?