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Proof step 1 from proof trim-number-02 (conclusion)

⊦ trim-number(trim-number(str)) = trim-number(str)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ trim-number(str) = string-right-trim("0123456789", str)
Proof step 3:
⊦ trim-number(string-right-trim("0123456789", str)) = string-right-trim("0123456789", str)

Rule argument

spec: string-ops inst: name: trim-number seq: ⊦ trim-number(str) = string-right-trim("0123456789", str) subst: [str] → [str] flags: rewrite, current

Additional information

Used terms: str