Step
*
of Lemma
win2strat-properties
∀g:SimpleGame. ∀n:ℕ+. ∀s:win2strat(g;n).
((s ∈ win2strat(g;n - 1))
∧ (s ∈ moves:{f:strat2play(g;n - 1;s)| ||f|| = (2 * n) ∈ ℤ} ⟶ {p:Pos(g)| Legal2(moves[(2 * n) - 1];p)} ))
BY
{ (Intros THEN Unfold `win2strat` -1 THEN (SplitOnHypITE -1 THENA Auto) THEN Try (DepIsectHD (-2)) THEN Auto) }
Latex:
Latex:
\mforall{}g:SimpleGame. \mforall{}n:\mBbbN{}\msupplus{}. \mforall{}s:win2strat(g;n).
((s \mmember{} win2strat(g;n - 1))
\mwedge{} (s \mmember{} moves:\{f:strat2play(g;n - 1;s)| ||f|| = (2 * n)\} {}\mrightarrow{} \{p:Pos(g)| Legal2(moves[(2 * n) - 1];p\000C)\} ))
By
Latex:
(Intros
THEN Unfold `win2strat` -1
THEN (SplitOnHypITE -1 THENA Auto)
THEN Try (DepIsectHD (-2))
THEN Auto)
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