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Proof step 18 from proof lls-unfold-tail (conclusion)

⊦ lls(r0, r2, x + a ') = _∃ λ r1. lls(r0, r1, x) * r1 => a × r2

User applied rule expand right

And obtained the following new goals

Proof step 17:
⊦ lls(r0, r2, x + a ')(H) ↔ (_∃ λ r1. lls(r0, r1, x) * r1 => a × r2)(H)

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ()]]