[Merged by Bors] - feat(algebra/pointwise): Scalar multiplication lemmas #11486
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This proves a bunch of lemmas about pointwise scalar multiplication of sets, moves `has_vsub` to `algebra.group.defs` and pointwise `vsub` lemmas to `algebra.pointwise`.
I'm also adding a few sections because having `{s t : set α}` is nice for multiplication but not for scalar multiplication.
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This proves a bunch of lemmas about pointwise scalar multiplication of sets, moves `has_vsub` to `algebra.group.defs` and pointwise `vsub` lemmas to `algebra.pointwise`.
I'm also adding a few sections because having `{s t : set α}` is nice for multiplication but not for scalar multiplication.
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This proves a bunch of lemmas about pointwise scalar multiplication of sets, moves `has_vsub` to `algebra.group.defs` and pointwise `vsub` lemmas to `algebra.pointwise`.
I'm also adding a few sections because having `{s t : set α}` is nice for multiplication but not for scalar multiplication.
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This proves a bunch of lemmas about pointwise scalar multiplication of sets, moves
has_vsubtoalgebra.group.defsand pointwisevsublemmas toalgebra.pointwise.I'm also adding a few sections because having
{s t : set α}is nice for multiplication but not for scalar multiplication.⋃/⋂lemmas to dependent families #11516