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theorem proved term proof

one_mul

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formal statement (Lean)

 194theorem one_mul (n : LogicNat) : succ zero * n = n := by

proof body

Term-mode proof.

 195  induction n with
 196  | identity => rfl
 197  | step n ih =>
 198    show succ zero * succ n = succ n
 199    rw [mul_succ, ih]
 200    show n + succ zero = succ n
 201    rw [add_succ, add_zero]
 202

used by (40)

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depends on (9)

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