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Proof step 1 from proof length-one (conclusion)

⊦ # char ' = 1

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ str ≠ "" → # (* str) = # str.rstring + 1

Rule argument

spec: string-less inst: name: len-str seq: ⊦ str ≠ "" → # (* str) = # str.rstring + 1 subst: [str] → [char '] flags: rewrite, current

Additional information

Used simplifier rules: rest: ⊦ char '.rstring = ""; from specification list[string-new]%size-01: ⊦ # "" = 0; from specification list-data[string-new]%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic2%c: ⊦ m + n = n + m; from specification nat-basic2%e: ⊦ char ' ≠ ""; from specification list[string-new] Used terms: char '