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Proof step 4 from proof blastN-len (previous step)

# x = n0 + n ⊦ # butlastn(n, x) = n0

User applied rule induction

And obtained the following new goals

Proof step 5:
# x = n0 + n, ∀ x0, n0, n. # x0 < # x → # x0 = n0 + n → # butlastn(n, x0) = n0 ⊦ # butlastn(n, x) = n0

Rule argument

indvar: # x wfpred: <

Additional information

Used simplifier rules: <; (wellfounded) Used terms: # x