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Proof step 4 from proof valid-journal-head-valid-group-nodes (previous step)

gstore[nx.last] = groupblock(gndx, lax, lnum), nx.last ∈ gstore, gstore[nx.last].gndlist = [] ∨ gstore[nx.last].gndlist.last.end ⊦ nx = [], valid-group-nodes(gndx) = # gndx, nx.last ∈ ginval

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
gstore[nx.last] = groupblock(gndx, lax, lnum), gndx.last.end, nx.last ∈ gstore ⊦ gndx = [], nx = [], valid-group-nodes(gndx) = # gndx, nx.last ∈ ginval

Rule argument

Additional information

Used simplifier rules: valid-group-nodes-base: ⊦ valid-group-nodes([]) = 0;% ⊦ # [] = 0; (s)% ⊦ groupblock(gndx, lax, m).gndlist = gndx; (s)