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Proof step 2 from proof ordered-postfix (previous step)

x ⊒ x0, ordered≤(x0) ⊦ ordered≤(x)

User applied rule structural induction

And obtained the following new goals

Proof step 3:
∀ x. x ⊒ x1 ∧ ordered≤(x1) → ordered≤(x), x ⊒ a + x1, ordered≤(a + x1) ⊦ ordered≤(x)

Rule argument

indvar: x0

Additional information

Used simplifier rules: list freely generated by [], +;;%postfix-empty-03: ⊦ x ⊒ [] ↔ x = []; from specification list-last