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Proof step 1 from proof valid-group-nodes-le (conclusion)
⊦ n ≤ valid-group-nodes(gndx) → n ≤ # gndx
System applied rule normalize
And obtained the following new goals
Proof step 2
:
n ≤ valid-group-nodes(gndx) ⊦ n ≤ # gndx
Rule argument
Additional information