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Proof step 6 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) ⊦ str1 = "", string-right-trim(str, str0 + str1) = string-right-trim(str, str0), str1.last ∈ str

User applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: str1.last abort: F discard: T computed: T

Additional information

Used simplifier rules: last-in: ⊦ str ≠ "" → str.last ∈ str; Used terms: str1.last