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Proof step 2 from proof append-to-le (previous step)

n ≤ # x ⊦ x + y to n = x to n

User applied rule structural induction

And obtained the following new goals

Proof step 3:
∀ n, y. n ≤ # x0 → x0 + y to n = x0 to n, n ≤ #(a + x0) ⊦ (a + x0) + y to n = a + x0 to n

Rule argument

indvar: x

Additional information

Used simplifier rules: to-zero-l: ⊦ x to 0 = [];%list freely generated by [], +;;%Nil: ⊦ [] + x = x; from specification list%a: ⊦ (x + y) + z = x + y + z; from specification list%size-01: ⊦ # [] = 0; from specification list-data%lez-01: ⊦ m ≤ 0 ↔ m = 0; from specification nat