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Proof step 1 from proof lst-01 (conclusion)

⊦ i < j + i0 ∧ j < j0 → i < j0 + i0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i < j + i0, j < j0, j0 + i0 < j + i0 ⊦ i < j0 + i0

Rule argument

Additional information

Used simplifier rules: lf-04: ⊦ ¬ j < i ∧ j < i0 → i < i0; (forward) from specification int-basic1