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Proof step 9 from proof valid-group-nodes-app-transaction-prefix (previous step)

gnd = mkgnode(nd, m, boolvar, boolvar0), transaction-prefix(ndx, gndx + gnd '), ∀ gndx2, ndx, gndx0. # gndx2 < #(gndx + gnd ') → transaction-prefix(ndx, gndx2) → valid-group-nodes(gndx0 + gndx2) = valid-group-nodes(gndx0) ⊦ (boolvar0 ⊃ (# gndx0 + # gndx) + 1;valid-group-nodes(gndx0 + gndx)) = valid-group-nodes(gndx0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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