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Proof step 3 from proof tr-fold (previous step)

(r => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1) * P)(H) ⊦ ∃ r0, r1. ((r => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1)) * P)(H)

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

[EXRARG : pos: right 1, [QUANTTERMLIST : (r0, r1)]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (P0 * P1) * P2 = P0 * P1 * P2], [CSIMPSEQ : ⊦ P0 * P1 = P1 * P0])], [EXTRATERMS : (r0, r1)]]