Inference procedure has parameters:
Ice fuel: 200
Timeout: 60s
Convolution: left


Learning problem is:

env: {
nat -> {s, z}
}
definition:
{
(eqnat, P:
{() -> eqnat([z, z])
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)])
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2])
(eqnat([s(x2), z])) -> BOT
(eqnat([z, s(u)])) -> BOT}
)
(leq, P:
{() -> leq([z, y])
(leq([z, x2])) -> leq([s(z), s(x2)])
(leq([s(z), s(x2)])) -> leq([z, x2])
(leq([s(z), z])) -> BOT}
)
}

properties:
{(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m])}


over-approximation: {leq}
under-approximation: {eqnat}

Clause system for inference is:

{
() -> eqnat([z, z]) -> 0
() -> leq([z, y]) -> 0
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 0
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 0
(eqnat([s(x2), z])) -> BOT -> 0
(eqnat([z, s(u)])) -> BOT -> 0
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 0
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 0
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 0
(leq([s(z), z])) -> BOT -> 0
}


Solving took 0.064534 seconds.
Proved
Model:
|_
{
eqnat -> 
{{{
Q={q_gen_3017},
Q_f={q_gen_3017},
Delta=
{
<s, s>(q_gen_3017) -> q_gen_3017
<z, z>() -> q_gen_3017
}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={q_gen_3016, q_gen_3021},
Q_f={q_gen_3016},
Delta=
{
<s>(q_gen_3021) -> q_gen_3021
<z>() -> q_gen_3021
<s, s>(q_gen_3016) -> q_gen_3016
<z, s>(q_gen_3021) -> q_gen_3016
<z, z>() -> q_gen_3016
}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

-------------------
STEPS:
-------------------------------------------
Step 0, which took 0.011232 s (model generation: 0.011048,  model checking: 0.000184):

Model:
|_
{
eqnat -> 
{{{
Q={},
Q_f={},
Delta=
{

}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={},
Q_f={},
Delta=
{

}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

Teacher's answer:
New clause system:
{
() -> eqnat([z, z]) -> 0
() -> leq([z, y]) -> 3
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 1
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 1
(eqnat([s(x2), z])) -> BOT -> 1
(eqnat([z, s(u)])) -> BOT -> 1
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 1
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 1
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 1
(leq([s(z), z])) -> BOT -> 1
}
Sat witness: Found: (() -> leq([z, y]), {
y -> z
})

-------------------------------------------
Step 1, which took 0.009619 s (model generation: 0.009573,  model checking: 0.000046):

Model:
|_
{
eqnat -> 
{{{
Q={},
Q_f={},
Delta=
{

}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={q_gen_3016},
Q_f={q_gen_3016},
Delta=
{
<z, z>() -> q_gen_3016
}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

Teacher's answer:
New clause system:
{
() -> eqnat([z, z]) -> 3
() -> leq([z, y]) -> 3
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 1
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 1
(eqnat([s(x2), z])) -> BOT -> 1
(eqnat([z, s(u)])) -> BOT -> 1
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 1
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 1
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 1
(leq([s(z), z])) -> BOT -> 1
}
Sat witness: Found: (() -> eqnat([z, z]), {

})

-------------------------------------------
Step 2, which took 0.007692 s (model generation: 0.007597,  model checking: 0.000095):

Model:
|_
{
eqnat -> 
{{{
Q={q_gen_3017},
Q_f={q_gen_3017},
Delta=
{
<z, z>() -> q_gen_3017
}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={q_gen_3016},
Q_f={q_gen_3016},
Delta=
{
<z, z>() -> q_gen_3016
}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

Teacher's answer:
New clause system:
{
() -> eqnat([z, z]) -> 3
() -> leq([z, y]) -> 3
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 1
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 1
(eqnat([s(x2), z])) -> BOT -> 1
(eqnat([z, s(u)])) -> BOT -> 1
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 1
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 4
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 2
(leq([s(z), z])) -> BOT -> 2
}
Sat witness: Found: ((leq([z, x2])) -> leq([s(z), s(x2)]), {
x2 -> z  ;  z -> z
})

-------------------------------------------
Step 3, which took 0.009125 s (model generation: 0.008989,  model checking: 0.000136):

Model:
|_
{
eqnat -> 
{{{
Q={q_gen_3017},
Q_f={q_gen_3017},
Delta=
{
<z, z>() -> q_gen_3017
}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={q_gen_3016},
Q_f={q_gen_3016},
Delta=
{
<s, s>(q_gen_3016) -> q_gen_3016
<z, z>() -> q_gen_3016
}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

Teacher's answer:
New clause system:
{
() -> eqnat([z, z]) -> 3
() -> leq([z, y]) -> 3
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 1
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 1
(eqnat([s(x2), z])) -> BOT -> 1
(eqnat([z, s(u)])) -> BOT -> 1
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 4
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 4
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 2
(leq([s(z), z])) -> BOT -> 2
}
Sat witness: Found: ((leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]), {
m -> s(z)  ;  n -> s(z)
})

-------------------------------------------
Step 4, which took 0.007581 s (model generation: 0.007385,  model checking: 0.000196):

Model:
|_
{
eqnat -> 
{{{
Q={q_gen_3017},
Q_f={q_gen_3017},
Delta=
{
<s, s>(q_gen_3017) -> q_gen_3017
<z, z>() -> q_gen_3017
}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={q_gen_3016},
Q_f={q_gen_3016},
Delta=
{
<s, s>(q_gen_3016) -> q_gen_3016
<z, z>() -> q_gen_3016
}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

Teacher's answer:
New clause system:
{
() -> eqnat([z, z]) -> 3
() -> leq([z, y]) -> 6
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 2
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 2
(eqnat([s(x2), z])) -> BOT -> 2
(eqnat([z, s(u)])) -> BOT -> 2
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 4
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 4
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 3
(leq([s(z), z])) -> BOT -> 3
}
Sat witness: Found: (() -> leq([z, y]), {
y -> s(z)
})

-------------------------------------------
Step 5, which took 0.010335 s (model generation: 0.007783,  model checking: 0.002552):

Model:
|_
{
eqnat -> 
{{{
Q={q_gen_3017},
Q_f={q_gen_3017},
Delta=
{
<s, s>(q_gen_3017) -> q_gen_3017
<z, z>() -> q_gen_3017
}

Datatype: <nat, nat>
Convolution form: left
}}}
  ;  leq -> 
{{{
Q={q_gen_3016, q_gen_3021},
Q_f={q_gen_3016},
Delta=
{
<z>() -> q_gen_3021
<s, s>(q_gen_3016) -> q_gen_3016
<z, s>(q_gen_3021) -> q_gen_3016
<z, z>() -> q_gen_3016
}

Datatype: <nat, nat>
Convolution form: left
}}}

}
--
Equality automata are defined for: {eq_nat}
_|

Teacher's answer:
New clause system:
{
() -> eqnat([z, z]) -> 4
() -> leq([z, y]) -> 9
(eqnat([x2, y2])) -> eqnat([s(x2), s(y2)]) -> 3
(eqnat([s(x2), s(y2)])) -> eqnat([x2, y2]) -> 3
(eqnat([s(x2), z])) -> BOT -> 3
(eqnat([z, s(u)])) -> BOT -> 3
(leq([m, n]) /\ leq([n, m])) -> eqnat([n, m]) -> 5
(leq([z, x2])) -> leq([s(z), s(x2)]) -> 5
(leq([s(z), s(x2)])) -> leq([z, x2]) -> 4
(leq([s(z), z])) -> BOT -> 4
}
Sat witness: Found: (() -> leq([z, y]), {
y -> s(s(z))
})

Total time: 0.064534
Reason for stopping: Proved