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destって何? #15

@2222-42

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@2222-42

why

lemma bcomp_succsに対して、

lemma bcomp_succs:
  "0 ≤ i ⟹
  succs (bcomp b f i) n ⊆ {n .. n + size (bcomp b f i)}
                           ∪ {n + i + size (bcomp b f i)}" 

[dest!]をつけたlemma がある。

lemmas bcomp_succsD [dest!] = bcomp_succs [THEN subsetD, rotated]
(* theorem bcomp_succsD: 
?c ∈ succs (bcomp ?b ?f ?i) ?n ⟹ 
0 ≤ ?i ⟹ 
?c ∈ {?n..?n + size (bcomp ?b ?f ?i)} ∪ {?n + ?i + size (bcomp ?b ?f ?i)} *)

このdestの意味はなにかわからん。

destributionか? -> destruction

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