f(true, x, y) → f(gt(x, y), s(x), s(s(y)))
gt(0, v) → false
gt(s(u), 0) → true
gt(s(u), s(v)) → gt(u, v)
Renamed function symbols to avoid clashes with predefined symbol.
Runtime Complexity TRS:
The TRS R consists of the following rules:
f'(true', x, y) → f'(gt'(x, y), s'(x), s'(s'(y)))
gt'(0', v) → false'
gt'(s'(u), 0') → true'
gt'(s'(u), s'(v)) → gt'(u, v)
Infered types.
Rules:
f'(true', x, y) → f'(gt'(x, y), s'(x), s'(s'(y)))
gt'(0', v) → false'
gt'(s'(u), 0') → true'
gt'(s'(u), s'(v)) → gt'(u, v)
Types:
f' :: true':false' → s':0' → s':0' → f'
true' :: true':false'
gt' :: s':0' → s':0' → true':false'
s' :: s':0' → s':0'
0' :: s':0'
false' :: true':false'
_hole_f'1 :: f'
_hole_true':false'2 :: true':false'
_hole_s':0'3 :: s':0'
_gen_s':0'4 :: Nat → s':0'
Heuristically decided to analyse the following defined symbols:
f', gt'
They will be analysed ascendingly in the following order:
gt' < f'
Rules:
f'(true', x, y) → f'(gt'(x, y), s'(x), s'(s'(y)))
gt'(0', v) → false'
gt'(s'(u), 0') → true'
gt'(s'(u), s'(v)) → gt'(u, v)
Types:
f' :: true':false' → s':0' → s':0' → f'
true' :: true':false'
gt' :: s':0' → s':0' → true':false'
s' :: s':0' → s':0'
0' :: s':0'
false' :: true':false'
_hole_f'1 :: f'
_hole_true':false'2 :: true':false'
_hole_s':0'3 :: s':0'
_gen_s':0'4 :: Nat → s':0'
Generator Equations:
_gen_s':0'4(0) ⇔ 0'
_gen_s':0'4(+(x, 1)) ⇔ s'(_gen_s':0'4(x))
The following defined symbols remain to be analysed:
gt', f'
They will be analysed ascendingly in the following order:
gt' < f'
Proved the following rewrite lemma:
gt'(_gen_s':0'4(_n6), _gen_s':0'4(_n6)) → false', rt ∈ Ω(1 + n6)
Induction Base:
gt'(_gen_s':0'4(0), _gen_s':0'4(0)) →RΩ(1)
false'
Induction Step:
gt'(_gen_s':0'4(+(_$n7, 1)), _gen_s':0'4(+(_$n7, 1))) →RΩ(1)
gt'(_gen_s':0'4(_$n7), _gen_s':0'4(_$n7)) →IH
false'
We have rt ∈ Ω(n) and sz ∈ O(n). Thus, we have ircR ∈ Ω(n).
Rules:
f'(true', x, y) → f'(gt'(x, y), s'(x), s'(s'(y)))
gt'(0', v) → false'
gt'(s'(u), 0') → true'
gt'(s'(u), s'(v)) → gt'(u, v)
Types:
f' :: true':false' → s':0' → s':0' → f'
true' :: true':false'
gt' :: s':0' → s':0' → true':false'
s' :: s':0' → s':0'
0' :: s':0'
false' :: true':false'
_hole_f'1 :: f'
_hole_true':false'2 :: true':false'
_hole_s':0'3 :: s':0'
_gen_s':0'4 :: Nat → s':0'
Lemmas:
gt'(_gen_s':0'4(_n6), _gen_s':0'4(_n6)) → false', rt ∈ Ω(1 + n6)
Generator Equations:
_gen_s':0'4(0) ⇔ 0'
_gen_s':0'4(+(x, 1)) ⇔ s'(_gen_s':0'4(x))
The following defined symbols remain to be analysed:
f'
Could not prove a rewrite lemma for the defined symbol f'.
Rules:
f'(true', x, y) → f'(gt'(x, y), s'(x), s'(s'(y)))
gt'(0', v) → false'
gt'(s'(u), 0') → true'
gt'(s'(u), s'(v)) → gt'(u, v)
Types:
f' :: true':false' → s':0' → s':0' → f'
true' :: true':false'
gt' :: s':0' → s':0' → true':false'
s' :: s':0' → s':0'
0' :: s':0'
false' :: true':false'
_hole_f'1 :: f'
_hole_true':false'2 :: true':false'
_hole_s':0'3 :: s':0'
_gen_s':0'4 :: Nat → s':0'
Lemmas:
gt'(_gen_s':0'4(_n6), _gen_s':0'4(_n6)) → false', rt ∈ Ω(1 + n6)
Generator Equations:
_gen_s':0'4(0) ⇔ 0'
_gen_s':0'4(+(x, 1)) ⇔ s'(_gen_s':0'4(x))
No more defined symbols left to analyse.
The lowerbound Ω(n) was proven with the following lemma:
gt'(_gen_s':0'4(_n6), _gen_s':0'4(_n6)) → false', rt ∈ Ω(1 + n6)