feat(data/set/basic): define set.subsingleton
#1939
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Also rename `nonempty.of_subset` to `nonempty.mono`
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sgouezel
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…#1939) * feat(data/set/basic): define `set.subsingleton` Also rename `nonempty.of_subset` to `nonempty.mono` * Add a missing lemma Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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May 16, 2020
…#1939) * feat(data/set/basic): define `set.subsingleton` Also rename `nonempty.of_subset` to `nonempty.mono` * Add a missing lemma Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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Also rename
nonempty.of_subsettononempty.monoTO CONTRIBUTORS:
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