This is used in Categories for the Working Mathematician to introduce two opposing functors U,V between the category of sets and the category of K-vector spaces, where K is a field.
Can this be done in a LaTeX code that renders on MSE?
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1How can I label \rightleftarrows above and below? might be interesting. – leandriis Aug 04 '20 at 19:16
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@campa, yes those answer my question – Daniel Donnelly Aug 07 '20 at 17:07