Step
*
2
of Lemma
sg-reachable_self
1. g : SimpleGame
2. x : Pos(g)
3. 0 < 1
4. seq-cons(x;seq-nil())[0] = x ∈ Pos(g)
5. seq-cons(x;seq-nil())[1 - 1] = x ∈ Pos(g)
6. ∀i:ℕ. ((2 * i) + 1 < 1
⇒ (↓Legal1(seq-cons(x;seq-nil())[2 * i];seq-cons(x;seq-nil())[(2 * i) + 1])))
7. i : ℕ+
8. 2 * i < 1
⊢ ↓Legal2(seq-cons(x;seq-nil())[(2 * i) - 1];seq-cons(x;seq-nil())[2 * i])
BY
{ ((Assert 2 ≤ (2 * i) BY Auto) THEN Auto) }
Latex:
Latex:
1. g : SimpleGame
2. x : Pos(g)
3. 0 < 1
4. seq-cons(x;seq-nil())[0] = x
5. seq-cons(x;seq-nil())[1 - 1] = x
6. \mforall{}i:\mBbbN{}
((2 * i) + 1 < 1 {}\mRightarrow{} (\mdownarrow{}Legal1(seq-cons(x;seq-nil())[2 * i];seq-cons(x;seq-nil())[(2 * i) + 1])))
7. i : \mBbbN{}\msupplus{}
8. 2 * i < 1
\mvdash{} \mdownarrow{}Legal2(seq-cons(x;seq-nil())[(2 * i) - 1];seq-cons(x;seq-nil())[2 * i])
By
Latex:
((Assert 2 \mleq{} (2 * i) BY Auto) THEN Auto)
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