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Proof step 3 from proof prefix-cut-l (previous step)

p = str + p1, p + str0 ' ⊑ str1 ' + q ⊦ p = ε, ∃ p0, q1. p = str1 ' + p0 ∧ q = p0 + str0 ' + q1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
p1 + str0 ' ⊑ q ⊦ ∃ q0. q = p1 + str0 ' + q0

Rule argument

Additional information

[Concretesimprules((Csimpseq(⊦ str ' + p = str0 ' + p0 ↔ str = str0 ∧ p = p0) Csimpseq(⊦ str ' + p ⊑ str0 ' + p0 ↔ str = str0 ∧ p ⊑ p0) Csimpseq( ⊦ (p + p0) + p1 = p + p0 + p1) Csimpseq( ⊦ str ' + p ≠ ε) Csimpseq( ⊦ str + p = str ' + p)))]