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Proof step 41 from proof prepost-remove-nonend-blocks (previous step)

# lax = (# gndx0 + 1) + # gndx, gstore2[n] = groupblock((gndx0 + mkgnode(nd, m1, boolvar, false) ') + gndx, lax, m), valid-group-nodes(gndx0) = valid-group-nodes((gndx0 + mkgnode(nd, m1, boolvar, false) ') + gndx), inv(gstore2 \ ginval), inv(groupblock((gndx0 + mkgnode(nd, m1, boolvar, false) ') + gndx, lax, m)), n ∈ gstore2 ⊦ ax0 + prefixn(# gndx0 + 1, lax).to-adr(n) = [], (ax0 + prefixn(# gndx0 + 1, lax).to-adr(n)).butlast = ax0 + prefixn(# gndx0, lax).to-adr(n), n ∈ ginval

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list-last, inst: address-list-set name: bapp seq: ⊦ ax ≠ [] → (ax0 + ax).butlast = ax0 + ax.butlast subst: [ax, ax0] → [prefixn(# gndx0 + 1, lax).to-adr(n), ax0] flags: <all paths>

Additional information

Used terms: prefixn(# gndx0 + 1, lax).to-adr(n), ax0