Mercurial > hg > Members > kono > Proof > ZF-in-agda
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¬∅=→∅∈ : {n : Level} → { x : OD {suc n} } → ¬ ( x == od∅ {suc n} ) → x ∋ od∅ {suc n}
¬∅=→∅∈ {n} {x} ne = def-subst (lemma (od→ord x) (subst (λ k → ¬ (k == od∅ {suc n} )) (sym oiso) ne )) oiso refl where
lemma : (ox : Ordinal {suc n}) → ¬ (ord→od ox == od∅ {suc n} ) → ord→od ox ∋ od∅ {suc n}
lemma ox = TransFinite {suc n} {λ ox → ¬ (ord→od ox == od∅ {suc n} ) → ord→od ox ∋ od∅ {suc n} } { }0 { }1 { }2 ox
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Thu, 30 May 2019 01:02:47 +0900 |
parents | 4fb2a239061d |
children | 94c796aee319 |