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Proof step 6 from proof lls-fold-head (previous step)

((r0 => a × r1 * lls(r1, r2, x) * P))(H) ⊦ ∃ r. (((r0 => a × r * lls(r, r2, x)) * P))(H)

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 1 terms: r1

Additional information

Used simplifier rules: sep-ass: ⊦ (P0 * P1) * P2 = P0 * P1 * P2; from specification heap-sep%sep-com: ⊦ P0 * P1 = P1 * P0; from specification heap-sep Used terms: r1