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import NNG.Levels.AdvAddition.Level_11
Game "NNG"
World "AdvAddition"
Level 12
Title "add_one_eq_succ"
open MyNat
Introduction
"
We have
```
succ_eq_add_one (n : ℕ) : succ n = n + 1
but sometimes the other way is also convenient.
Statement MyNat.add_one_eq_succ
"For any natural number $d$, we have
$$ d+1 = \\operatorname{succ}(d). $$"
(d : ℕ) : d + 1 = succ d := by
rw [succ_eq_add_one]
rfl
LemmaTab "Add"
Conclusion