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Proof step 12 from proof rm-vl-append-same (previous step)

∀ n, lref. q0 + eq-entry(n, lref) ' - lref = q0 - lref ⊦ (lref0 = lref ⊃ q0 + eq-entry(n, lref) ' - lref;eq-entry(m, lref0) ' + (q0 + eq-entry(n, lref) ' - lref)) = (lref0 = lref ⊃ q0 - lref;eq-entry(m, lref0) ' + (q0 - lref))

Heuristic if-then-else split applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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