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Proof step 1 from proof nodups-new-nodups (conclusion)

⊦ new(ax, fs) ∧ ¬ dups(ax) ∧ ¬ dups(log) ∧ log-cons(log, fs) → (dups(log + ax) ↔ false)

System applied rule normalize

And obtained the following new goals

Proof step 2:
log-cons(log, fs), new(ax, fs) ⊦ dups(log + ax) ↔ false, dups(log), dups(ax)

Rule argument

Additional information