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Proof step 1 from proof postifx-split (conclusion)

x ⊒ y + z, ¬ x ⊒ z ⊦ ∃ x0. x0 + z = x

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
x ⊒ y + z ⊦ x ⊒ z, ∃ x0. x0 + z = x

Rule argument

Additional information