[Merged by Bors] - feat: When Nat.card is zero
#8202
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Co-authored-by: Bhavik Mehta <[email protected]>
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Nat.card is zeroNat.card is zero
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This was accidentally put in the `PartENat` namespace in #8202. Also add `Set.Infinite.card_eq_zero` and fix capitalisation errors.
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This was accidentally put in the `PartENat` namespace in #8202. Also add `Set.Infinite.card_eq_zero` and fix capitalisation errors.
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This was accidentally put in the `PartENat` namespace in #8202. Also add `Set.Infinite.card_eq_zero` and fix capitalisation errors.
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This was accidentally put in the `PartENat` namespace in #8202. Also add `Set.Infinite.card_eq_zero` and fix capitalisation errors.
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This was accidentally put in the `PartENat` namespace in #8202. Also add `Set.Infinite.card_eq_zero` and fix capitalisation errors.
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and lemmas about injectivity/surjectivity of
PLift.map/ULift.map.I need this for Kneser's addition theorem.