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Proof step 17 from proof sw (previous step)

b < a, ∀ a, b. ins≤(a, ins≤(b, x0)) = ins≤(b, ins≤(a, x0)) ⊦ b ' + ins≤(a, a0 ' + x0) = ins≤(b, ins≤(a, a0 ' + x0)), a0 < b

Heuristic weak cut applied rule cut formula

And closed the goal!

Rule argument

fma: a0 < a

Additional information

Used simplifier rules: ins-n: ⊦ b < a → ins≤(a, b ' + x) = b + ins≤(a, x);%ins-y: ⊦ ¬ b < a → ins≤(a, b ' + x) = a + b + x;%ins-y: ⊦ ¬ b < a → ins≤(a, b ' + x) = a + b + x;%ins-y-01: ⊦ a < b → ins≤(a, b ' + x) = a + b + x;%c: ⊦ a + x = a ' + x; from specification list%a: ⊦ (x + y) + z = x + y + z; from specification list%app-08: ⊦ a ' + x = a ' + y ↔ x = y; from specification list Used formulas: a0 < a