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Proof step 17 from proof rmpos-get (previous step)

m1 < # x0, m1 < n, n < # x0, m1 + 1 < # x0, ∀ m0, n0. m0 < # x0 ∧ n0 + 1 < # x0 → (x0 -1l m0)[n0] = (n0 < m0 ⊃ x0[n0];x0.rest[n0]) ⊦ n = 0, (a ' + (x0 -1l m1))[n] = x0[n], x0 = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 18:
⊦ ¬ n < # x → (x + y)[n] = y[n - # x]
Proof step 19:
¬ n < # a ', m1 < # x0, m1 < n, n < # x0, m1 + 1 < # x0, ∀ m0, n0. m0 < # x0 ∧ n0 + 1 < # x0 → (x0 -1l m0)[n0] = (n0 < m0 ⊃ x0[n0];x0.rest[n0]) ⊦ n = 0, (x0 -1l m1)[n - # a '] = x0[n], x0 = []

Rule argument

spec: inst: name: get-append-grt seq: ⊦ ¬ n < # x → (x + y)[n] = y[n - # x] subst: [n, y, x] → [n, x0 -1l m1, a '] flags: rewrite, current

Additional information

Used simplifier rules: len-02: ⊦ # a ' = 0 +1; from specification list%one-01: ⊦ m < 1 ↔ m = 0; from specification nat-basic1 Used terms: n, x0 -1l m1, a '