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Proof step 2 from proof valid-group-nodes-app-transaction (previous step)

transaction(ndx, gndx1) ⊦ valid-group-nodes(gndx0 + gndx1) = (gndx1 = [] ⊃ valid-group-nodes(gndx0);# gndx0 + # gndx1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information