Commit 2021-01-24 20:25 fbabe427

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feat(order/complete_well_founded, data/finset/lattice): introduce compact elements of a complete lattice and characterize compact lattices as those with all elements compact (#5825) Provide a definition of compact elements. Prove the equivalence of two characterizations of compact elements. Add "all elements are compact" to the equivalent characterizations of compact lattices. Introduce an auxiliary lemma about finite sups and directed sets.

<!-- A reference for the two equivalent definitions of compact element can be found [here](https://ncatlab.org/nlab/show/compact+element+in+a+lattice) -->

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