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Proof step 3 from proof postfix-length (previous step)

# y < # x, x ⊒ y ⊦ x = []

User applied rule structural induction

And obtained the following new goals

Proof step 4:
# y < #(a + x0), a + x0 ⊒ y, ∀ y. # y < # x0 ∧ x0 ⊒ y → x0 = [] ⊦ a + x0 = []

Rule argument

indvar: x

Additional information

Used simplifier rules: list freely generated by [], +;;