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Proof step 2 from proof right-trim-app (previous step)

∀ char. char ∈ str1 → char ∈ str, ∀ str0, str, str2. # str2 < # str1 → (∀ char. char ∈ str2 → char ∈ str) → string-right-trim(str, str0 + str2) = string-right-trim(str, str0) ⊦ string-right-trim(str, str0 + str1) = string-right-trim(str, str0)

User applied rule cut formula

And obtained the following new goals

Proof step 3:
∀ char. char ∈ str1 → char ∈ str, ∀ str0, str, str2. # str2 < # str1 → (∀ char. char ∈ str2 → char ∈ str) → string-right-trim(str, str0 + str2) = string-right-trim(str, str0) ⊦ str1 = "", string-right-trim(str, str0 + str1) = string-right-trim(str, str0)

Rule argument

fma: str1 = ""

Additional information

Used simplifier rules: ⊦ str1 + "" = str1;% ⊦ (str1 + str2) + str3 = str1 + str2 + str3; Used formulas: str1 = ""