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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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