Mercurial > hg > Members > kono > Proof > ZF-in-agda
diff src/BAlgbra.agda @ 450:b27d92694ed5
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 14 Mar 2022 17:51:16 +0900 |
parents | a5f8084b8368 |
children | 31f0a5a745a5 |
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--- a/src/BAlgbra.agda Sun Mar 13 19:22:12 2022 +0900 +++ b/src/BAlgbra.agda Mon Mar 14 17:51:16 2022 +0900 @@ -37,6 +37,9 @@ --A ∩ B = record { od = record { def = λ x → odef A x ∧ odef B x } ; -- odmax = omin (odmax A) (odmax B) ; <odmax = λ y → min1 (<odmax A (proj1 y)) (<odmax B (proj2 y)) } +∩-comm : { A B : HOD } → (A ∩ B) ≡ (B ∩ A) +∩-comm {A} {B} = ==→o≡ record { eq← = λ {x} lt → ⟪ proj2 lt , proj1 lt ⟫ ; eq→ = λ {x} lt → ⟪ proj2 lt , proj1 lt ⟫ } + _∪_ : ( A B : HOD ) → HOD A ∪ B = record { od = record { def = λ x → odef A x ∨ odef B x } ; odmax = omax (odmax A) (odmax B) ; <odmax = lemma } where