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[Merged by Bors] - feat(data/pfun): Product of partial functions #15389
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| @[simp] lemma dom_prod_lift (f : α →. β) (g : α →. γ) : | ||
| (f.prod_lift g).dom = {x | (f x).dom ∧ (g x).dom} := rfl | ||
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| lemma get_prod_lift (f : α →. β) (g : α →. γ) (x : α) (h) : |
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Can you use simps to generate these automatically?
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No because α →. β × γ is not a structure. Maybe something can be done, but I don't know how simps works 😢
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Define `pfun.prod : (α →. γ) → (β →. δ) → α × β →. γ × δ`.
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Define `pfun.prod : (α →. γ) → (β →. δ) → α × β →. γ × δ`.
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Define
pfun.prod : (α →. γ) → (β →. δ) → α × β →. γ × δ.