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Proof step 16 from proof ll-trav2-next (previous step)

(((r2 => a × r * lls(r, null, y)) * lls(r0, r1, x0) * r1 => a0 × r2 * P))(H) ⊦ r1 = null, r2 = null, ∃ r1. (((lls(r0, r1, x0) * r1 => a0 × r2) * r2 => a × r * lls(r, null, y) * P))(H)

User applied rule exists right

And closed the goal!

Rule argument

pos: right 3 terms: r1 abort: F discard: T computed: F

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