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Proof step 11 from proof coprimes-prime (previous step)

i ≠ 1, prime(i), 0 < i ⊦ filterFun(λ j. gcd(i, j) = 1, count-i2j(1, i - 1)) + [] = count-i2j(1, i - 1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
prime(i), 0 < i ⊦ i = 1, filterFun(λ j. gcd(i, j) = 1, count-i2j(1, i - 1)) = count-i2j(1, i - 1)

Rule argument

Additional information

Used simplifier rules: a: ⊦ (ints + ints0) + ints1 = ints + ints0 + ints1; from specification list[intlista]%app: ⊦ ints + [] = ints; from specification list[intlista]