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Proof step 20 from proof term-remove-nonend-blocks (previous step)

gstore2[n] = groupblock(gndx, lax, m), # ax0 + # lax < # gndx, inv(gstore2), n ∈ gstore2 ⊦ gndx = [], n ∈ ginval

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 21:
gstore2[n] = groupblock(gndx, lax, m), # ax0 + # lax < # gndx, inv(groupblock(gndx, lax, m)), inv(gstore2), n ∈ gstore2 ⊦ gndx = [], n ∈ ginval

Rule argument

Additional information

Used simplifier rules: ⊦ # gndx = 0 ↔ gndx = []; (s)%fwd-inv-gblock: ⊦ inv(gstore) ∧ n ∈ gstore ∧ gstore[n] = gblock → inv(gblock); (forward) from specification apersistence-base%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic