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Proof step 6 from proof last-in (previous step)

s→l(str0).last ∈ str0 ⊦ char ' + str0 = "", (char ' + s→l(str0)).last = char, str0 = "", (char ' + s→l(str0)).last ∈ str0

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 7:
s→l(str0).last ∈ str0 ⊦ s→l(str0) = [], char ' + str0 = "", (char ' + s→l(str0)).last = char, str0 = "", (char ' + s→l(str0)).last ∈ str0

Rule argument

fma: s→l(str0) = []

Additional information

Used simplifier rules: ⊦ s→l(str) = [] ↔ str = ""; Used formulas: s→l(str0) = []