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Proof step 8 from proof ad (previous step)

a ∈ y ⊦ #oc(a1, (x + y) -1l a) ≤ #oc(a1, x) + #oc(a1, y -1l a)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: <toplevel> name: del1-01 seq: ⊦ a ≠ b → #oc(a, x -1l b) = #oc(a, x) subst: [b, x, a] → [a, y, a1] flags: <all paths>

Additional information

Used simplifier rules: oc-del-01: ⊦ a ∈ y → #oc(a, (x + y) -1l a) = #oc(a, x + y) -1;%ocappend: ⊦ #oc(a, x + y) = #oc(a, x) + #oc(a, y);%del1: ⊦ a ∈ x → #oc(a, x -1l a) = #oc(a, x) -1;%oc-zero: ⊦ #oc(a, x) = 0 ↔ ¬ a ∈ x;%del1-01: ⊦ a ≠ b → #oc(a, x -1l b) = #oc(a, x);%ocappend: ⊦ #oc(a, x + y) = #oc(a, x) + #oc(a, y);%a: ⊦ (x + y) + z = x + y + z; from specification list% ⊦ m + n ≤ m + n0 ↔ n ≤ n0; (s)% ⊦ m ≤ n ↔ ¬ n < m; (ss)% ⊦ ¬ n < n; (s)%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic% ⊦ n -1 = n - 1; (s)% ⊦ m < 1 ↔ m = 0; (s)% ⊦ m + n = 0 ↔ m = 0 ∧ n = 0; (ws)%n0 ≤ n ⊦ n - n0 ≤ m ↔ n ≤ m + n0; (s)% ⊦ ¬ n + (m - n) < m; (s) Used terms: a, y, a1