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theorem proved term proof

zero_add

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formal statement (Lean)

 140theorem zero_add (n : LogicNat) : zero + n = n := by

proof body

Term-mode proof.

 141  induction n with
 142  | identity => rfl
 143  | step n ih =>
 144    show zero + succ n = succ n
 145    rw [add_succ, ih]
 146

used by (36)

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depends on (7)

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