[Merged by Bors] - chore(data/finsupp/basic): more lemmas about α →₀ ℕ
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* define `canonically_ordered_add_monoid` instance; * add a few simp lemmas; * more lemmas about product over `finsupp.antidiagonal n`; * define `finsupp.Iic_finset`, use it for `finite_le_nat`.
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Very nice additions! bors merge |
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α →₀ ℕα →₀ ℕ
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canonically_ordered_add_monoidinstance;finsupp.antidiagonal n;finsupp.Iic_finset, use it forfinite_le_nat.