The Runtime Complexity (full) of the given CpxTRS could be proven to be BOUNDS(n^1, INF).

(0) Obligation:

Runtime Complexity TRS:
The TRS R consists of the following rules:

eq(0, 0) → true
eq(0, s(x)) → false
eq(s(x), 0) → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Rewrite Strategy: FULL

(1) DecreasingLoopProof (EQUIVALENT transformation)

The following loop(s) give(s) rise to the lower bound Ω(n¹):
The rewrite sequence
eq(s(x), s(y)) →⁺ eq(x, y)
gives rise to a decreasing loop by considering the right hand sides subterm at position [].
The pumping substitution is [x / s(x), y / s(y)].
The result substitution is [ ].

(2) BOUNDS(n^1, INF)

(3) RenamingProof (EQUIVALENT transformation)

Renamed function symbols to avoid clashes with predefined symbol.

(4) Obligation:

Runtime Complexity Relative TRS:
The TRS R consists of the following rules:

eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

S is empty.
Rewrite Strategy: FULL

(5) TypeInferenceProof (BOTH BOUNDS(ID, ID) transformation)

Infered types.

(6) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

(7) OrderProof (LOWER BOUND(ID) transformation)

Heuristically decided to analyse the following defined symbols:
eq, union, reach

They will be analysed ascendingly in the following order:
eq < reach
union < reach

(8) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

Generator Equations:
gen_0':s4_0(0) ⇔ 0'
gen_0':s4_0(+(x, 1)) ⇔ s(gen_0':s4_0(x))
gen_empty:edge5_0(0) ⇔ empty
gen_empty:edge5_0(+(x, 1)) ⇔ edge(0', 0', gen_empty:edge5_0(x))

The following defined symbols remain to be analysed:
eq, union, reach

They will be analysed ascendingly in the following order:
eq < reach
union < reach

(9) RewriteLemmaProof (LOWER BOUND(ID) transformation)

Proved the following rewrite lemma:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)

Induction Base:
eq(gen_0':s4_0(0), gen_0':s4_0(0)) →_R^Ω(1)
true

Induction Step:
eq(gen_0':s4_0(+(n7_0, 1)), gen_0':s4_0(+(n7_0, 1))) →_R^Ω(1)
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) →_IH
true

We have rt ∈ Ω(n¹) and sz ∈ O(n). Thus, we have irc_R ∈ Ω(n).

(10) Complex Obligation (BEST)

(11) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

Lemmas:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)

Generator Equations:
gen_0':s4_0(0) ⇔ 0'
gen_0':s4_0(+(x, 1)) ⇔ s(gen_0':s4_0(x))
gen_empty:edge5_0(0) ⇔ empty
gen_empty:edge5_0(+(x, 1)) ⇔ edge(0', 0', gen_empty:edge5_0(x))

The following defined symbols remain to be analysed:
union, reach

They will be analysed ascendingly in the following order:
union < reach

(12) RewriteLemmaProof (LOWER BOUND(ID) transformation)

Proved the following rewrite lemma:
union(gen_empty:edge5_0(n594_0), gen_empty:edge5_0(b)) → gen_empty:edge5_0(+(n594_0, b)), rt ∈ Ω(1 + n594₀)

Induction Base:
union(gen_empty:edge5_0(0), gen_empty:edge5_0(b)) →_R^Ω(1)
gen_empty:edge5_0(b)

Induction Step:
union(gen_empty:edge5_0(+(n594_0, 1)), gen_empty:edge5_0(b)) →_R^Ω(1)
edge(0', 0', union(gen_empty:edge5_0(n594_0), gen_empty:edge5_0(b))) →_IH
edge(0', 0', gen_empty:edge5_0(+(b, c595_0)))

We have rt ∈ Ω(n¹) and sz ∈ O(n). Thus, we have irc_R ∈ Ω(n).

(13) Complex Obligation (BEST)

(14) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

Lemmas:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)
union(gen_empty:edge5_0(n594_0), gen_empty:edge5_0(b)) → gen_empty:edge5_0(+(n594_0, b)), rt ∈ Ω(1 + n594₀)

Generator Equations:
gen_0':s4_0(0) ⇔ 0'
gen_0':s4_0(+(x, 1)) ⇔ s(gen_0':s4_0(x))
gen_empty:edge5_0(0) ⇔ empty
gen_empty:edge5_0(+(x, 1)) ⇔ edge(0', 0', gen_empty:edge5_0(x))

The following defined symbols remain to be analysed:
reach

(15) NoRewriteLemmaProof (LOWER BOUND(ID) transformation)

Could not prove a rewrite lemma for the defined symbol reach.

(16) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

Lemmas:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)
union(gen_empty:edge5_0(n594_0), gen_empty:edge5_0(b)) → gen_empty:edge5_0(+(n594_0, b)), rt ∈ Ω(1 + n594₀)

Generator Equations:
gen_0':s4_0(0) ⇔ 0'
gen_0':s4_0(+(x, 1)) ⇔ s(gen_0':s4_0(x))
gen_empty:edge5_0(0) ⇔ empty
gen_empty:edge5_0(+(x, 1)) ⇔ edge(0', 0', gen_empty:edge5_0(x))

No more defined symbols left to analyse.

(17) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)

(18) BOUNDS(n^1, INF)

(19) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

Lemmas:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)
union(gen_empty:edge5_0(n594_0), gen_empty:edge5_0(b)) → gen_empty:edge5_0(+(n594_0, b)), rt ∈ Ω(1 + n594₀)

Generator Equations:
gen_0':s4_0(0) ⇔ 0'
gen_0':s4_0(+(x, 1)) ⇔ s(gen_0':s4_0(x))
gen_empty:edge5_0(0) ⇔ empty
gen_empty:edge5_0(+(x, 1)) ⇔ edge(0', 0', gen_empty:edge5_0(x))

No more defined symbols left to analyse.

(20) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)

(21) BOUNDS(n^1, INF)

(22) Obligation:

TRS:
Rules:
eq(0', 0') → true
eq(0', s(x)) → false
eq(s(x), 0') → false
eq(s(x), s(y)) → eq(x, y)
or(true, y) → true
or(false, y) → y
union(empty, h) → h
union(edge(x, y, i), h) → edge(x, y, union(i, h))
isEmpty(empty) → true
isEmpty(edge(x, y, i)) → false
from(edge(x, y, i)) → x
to(edge(x, y, i)) → y
rest(edge(x, y, i)) → i
rest(empty) → empty
reach(x, y, i, h) → if1(eq(x, y), isEmpty(i), eq(x, from(i)), eq(y, to(i)), x, y, i, h)
if1(true, b1, b2, b3, x, y, i, h) → true
if1(false, b1, b2, b3, x, y, i, h) → if2(b1, b2, b3, x, y, i, h)
if2(true, b2, b3, x, y, i, h) → false
if2(false, b2, b3, x, y, i, h) → if3(b2, b3, x, y, i, h)
if3(false, b3, x, y, i, h) → reach(x, y, rest(i), edge(from(i), to(i), h))
if3(true, b3, x, y, i, h) → if4(b3, x, y, i, h)
if4(true, x, y, i, h) → true
if4(false, x, y, i, h) → or(reach(x, y, rest(i), h), reach(to(i), y, union(rest(i), h), empty))

Types:
eq :: 0':s → 0':s → true:false
0' :: 0':s
true :: true:false
s :: 0':s → 0':s
false :: true:false
or :: true:false → true:false → true:false
union :: empty:edge → empty:edge → empty:edge
empty :: empty:edge
edge :: 0':s → 0':s → empty:edge → empty:edge
isEmpty :: empty:edge → true:false
from :: empty:edge → 0':s
to :: empty:edge → 0':s
rest :: empty:edge → empty:edge
reach :: 0':s → 0':s → empty:edge → empty:edge → true:false
if1 :: true:false → true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if2 :: true:false → true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if3 :: true:false → true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
if4 :: true:false → 0':s → 0':s → empty:edge → empty:edge → true:false
hole_true:false1_0 :: true:false
hole_0':s2_0 :: 0':s
hole_empty:edge3_0 :: empty:edge
gen_0':s4_0 :: Nat → 0':s
gen_empty:edge5_0 :: Nat → empty:edge

Lemmas:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)

Generator Equations:
gen_0':s4_0(0) ⇔ 0'
gen_0':s4_0(+(x, 1)) ⇔ s(gen_0':s4_0(x))
gen_empty:edge5_0(0) ⇔ empty
gen_empty:edge5_0(+(x, 1)) ⇔ edge(0', 0', gen_empty:edge5_0(x))

No more defined symbols left to analyse.

(23) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
eq(gen_0':s4_0(n7_0), gen_0':s4_0(n7_0)) → true, rt ∈ Ω(1 + n7₀)

(24) BOUNDS(n^1, INF)