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Proof step 2 from proof s2n-app (previous step)

⊦ str = "", str0 = "", s→n(str + str0) = s→n(str) * 10 ^ # str0 + s→n(str0)

User applied rule structural induction

And obtained the following new goals

Proof step 3:
∀ str0. str1 = "" ∨ str0 = "" ∨ s→n(str1 + str0) = s→n(str1) * 10 ^ # str0 + s→n(str0) ⊦ char + str1 = "", str0 = "", s→n((char + str1) + str0) = s→n(char + str1) * 10 ^ # str0 + s→n(str0)

Rule argument

indvar: str

Additional information

Used simplifier rules: string freely generated by "", +;;