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get game building again!

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Kevin Buzzard
2023-10-14 19:09:15 +01:00
parent 2cd3b9a47b
commit b260a53f82
2 changed files with 4 additions and 1 deletions
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3
Game/Levels/AdvAddition/L01ne_succ_self.lean
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@@ -15,6 +15,9 @@ which is a warm-up to see if you remember `zero_ne_succ`
and `succ_inj`, and how to use the `apply` tactic. and `succ_inj`, and how to use the `apply` tactic.
" "
LemmaDoc MyNat.ne_succ_self as "ne_succ_self" in "≤" "
`ne_succ_self n` is the proof that `n ≠ succ n`."
/-- $n\neq\operatorname{succ}(n)$. -/ /-- $n\neq\operatorname{succ}(n)$. -/
Statement ne_succ_self (n : ℕ) : n ≠ succ n := by Statement ne_succ_self (n : ℕ) : n ≠ succ n := by
Hint "Start with `induction`." Hint "Start with `induction`."

2
Game/Levels/LessOrEqual/L03le_succ_self.lean
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@@ -13,7 +13,7 @@ LemmaDoc MyNat.le_succ_self as "le_succ_self" in "≤" "
NewLemma MyNat.le_succ_self NewLemma MyNat.le_succ_self
/-- If $x$ is a number, then $x \le \operatorname{succ}(x)$. -/ /-- If $x$ is a number, then $x \le \operatorname{succ}(x)$. -/
Statement (x : ℕ) : x ≤ succ x := by Statement le_succ_self (x : ℕ) : x ≤ succ x := by
use 1 use 1
rw [succ_eq_add_one] rw [succ_eq_add_one]
rfl rfl