[Merged by Bors] - feat(data/quot,data/set/basic): add lemmas about lift
#17699
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* Add `Quot.surjective_lift` and `Quotient.surjective_liftOn'`. * This is the `mathlib4` version of leanprover-community/mathlib#17699.
urkud
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eric-wieser
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| begin | ||
| rw [matrix.to_linear_map₂, linear_map.to_matrix₂, linear_equiv.symm_trans_apply, | ||
| ←matrix.to_linear_map₂'], | ||
| simp [matrix.to_linear_map₂'_apply], | ||
| end |
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Can you either mention this in the PR description or remove it from the PR?
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Was this intended as a fixup to #17705?
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Yes, I've got a timeout and fixed it.
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* Add `quot.surjective_lift`, `quotient.surjective_lift_on'`. * Mark `quot.lift_mk` as `simp`. * Add `set.range_quot_lift`, `set.range_quotient_lift`, `set.range_quotient_mk'`, and `set.range_quotient_lift_on'`. * The `mathlib4` version: leanprover-community/mathlib4#701. * Prove `matrix.to_linear_map₂_apply` by `rfl`.
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* Add `quot.surjective_lift`, `quotient.surjective_lift_on'`. * Mark `quot.lift_mk` as `simp`. * Add `set.range_quot_lift`, `set.range_quotient_lift`, `set.range_quotient_mk'`, and `set.range_quotient_lift_on'`. * The `mathlib4` version: leanprover-community/mathlib4#701. * Prove `matrix.to_linear_map₂_apply` by `rfl`.
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quot.surjective_lift,quotient.surjective_lift_on'.quot.lift_mkassimp.set.range_quot_lift,set.range_quotient_lift,set.range_quotient_mk', andset.range_quotient_lift_on'.mathlib4version: [Merged by Bors] - feat(Data/Quot): add 2 lemmas mathlib4#701.matrix.to_linear_map₂_applybyrfl.