feat(set_theory/cardinal): eq_one_iff_subsingleton_and_nonempty #1770
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sgouezel
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…prover-community#1770) * feat(set_theory/cardinal): eq_one_iff_subsingleton_and_nonempty From the perfectoid project * Update src/set_theory/cardinal.lean
anrddh
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…prover-community#1770) * feat(set_theory/cardinal): eq_one_iff_subsingleton_and_nonempty From the perfectoid project * Update src/set_theory/cardinal.lean
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From the perfectoid project.