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Proof step 13 from proof extensionality (previous step)

∀ n. nf(n) = nf0(n) ⊦ nf = nf0

User applied rule expand right

And obtained the following new goals

Proof step 14:
∀ n. nf(n) = nf0(n) ⊦ nf(n) = nf0(n)

Rule argument

pos: right 1

Additional information