YES

Problem 1: 

Infeasibility Problem:
[(VAR vNonEmpty y x vNonEmpty x y)
(STRATEGY CONTEXTSENSITIVE
(f 1 2)
(g 1 2)
(F 1 2)
(a)
(b)
(fSNonEmpty)
(h 1)
)
(RULES
f(x,a) -> f(x,g(x,b))
g(a,y) -> y
g(h(x),y) -> g(x,h(y))
)
]
Infeasibility Conditions:
F(x,g(x,b)) ->* F(y,a)

Problem 1: 

Obtaining a model using Mace4:

 -> Usable Rules:
f(x,a) -> f(x,g(x,b))
g(a,y) -> y
g(h(x),y) -> g(x,h(y))

 -> Mace4 Output:
============================== Mace4 =================================
Mace4 (64) version 2009-11A, November 2009.
Process 3187366 was started by sandbox on z023.star.cs.uiowa.edu,
Tue Jul 30 08:34:55 2024
The command was "./mace4 -c -f /tmp/mace43187353-2.in".
============================== end of head ===========================

============================== INPUT =================================

% Reading from file /tmp/mace43187353-2.in

assign(max_seconds,100).

formulas(assumptions).
->(x1,y) -> ->(f(x1,x2),f(y,x2)) # label(congruence).
->(x2,y) -> ->(f(x1,x2),f(x1,y)) # label(congruence).
->(x1,y) -> ->(g(x1,x2),g(y,x2)) # label(congruence).
->(x2,y) -> ->(g(x1,x2),g(x1,y)) # label(congruence).
->(x1,y) -> ->(F(x1,x2),F(y,x2)) # label(congruence).
->(x2,y) -> ->(F(x1,x2),F(x1,y)) # label(congruence).
->(x1,y) -> ->(h(x1),h(y)) # label(congruence).
->(f(x2,a),f(x2,g(x2,b))) # label(replacement).
->(g(a,x1),x1) # label(replacement).
->(g(h(x2),x1),g(x2,h(x1))) # label(replacement).
->*(x,x) # label(reflexivity).
->(x,y) & ->*(y,z) -> ->*(x,z) # label(transitivity).
end_of_list.

formulas(goals).
(exists x4 exists x5 ->*(F(x4,g(x4,b)),F(x5,a))) # label(goal).
end_of_list.

============================== end of input ==========================

============================== PROCESS NON-CLAUSAL FORMULAS ==========

% Formulas that are not ordinary clauses:
1 ->(x1,y) -> ->(f(x1,x2),f(y,x2)) # label(congruence) # label(non_clause).  [assumption].
2 ->(x2,y) -> ->(f(x1,x2),f(x1,y)) # label(congruence) # label(non_clause).  [assumption].
3 ->(x1,y) -> ->(g(x1,x2),g(y,x2)) # label(congruence) # label(non_clause).  [assumption].
4 ->(x2,y) -> ->(g(x1,x2),g(x1,y)) # label(congruence) # label(non_clause).  [assumption].
5 ->(x1,y) -> ->(F(x1,x2),F(y,x2)) # label(congruence) # label(non_clause).  [assumption].
6 ->(x2,y) -> ->(F(x1,x2),F(x1,y)) # label(congruence) # label(non_clause).  [assumption].
7 ->(x1,y) -> ->(h(x1),h(y)) # label(congruence) # label(non_clause).  [assumption].
8 ->(x,y) & ->*(y,z) -> ->*(x,z) # label(transitivity) # label(non_clause).  [assumption].
9 (exists x4 exists x5 ->*(F(x4,g(x4,b)),F(x5,a))) # label(goal) # label(non_clause) # label(goal).  [goal].

============================== end of process non-clausal formulas ===

============================== CLAUSES FOR SEARCH ====================

formulas(mace4_clauses).
-->(x,y) | ->(f(x,z),f(y,z)) # label(congruence).
-->(x,y) | ->(f(z,x),f(z,y)) # label(congruence).
-->(x,y) | ->(g(x,z),g(y,z)) # label(congruence).
-->(x,y) | ->(g(z,x),g(z,y)) # label(congruence).
-->(x,y) | ->(F(x,z),F(y,z)) # label(congruence).
-->(x,y) | ->(F(z,x),F(z,y)) # label(congruence).
-->(x,y) | ->(h(x),h(y)) # label(congruence).
->(f(x,a),f(x,g(x,b))) # label(replacement).
->(g(a,x),x) # label(replacement).
->(g(h(x),y),g(x,h(y))) # label(replacement).
->*(x,x) # label(reflexivity).
-->(x,y) | -->*(y,z) | ->*(x,z) # label(transitivity).
-->*(F(x,g(x,b)),F(y,a)) # label(goal).
end_of_list.

============================== end of clauses for search =============

% There are no natural numbers in the input.

============================== DOMAIN SIZE 2 =========================

============================== MODEL =================================

interpretation( 2, [number=1, seconds=0], [

        function(a, [ 0 ]),

        function(b, [ 1 ]),

        function(h(_), [ 0, 1 ]),

        function(f(_,_), [
			   0, 0,
			   0, 0 ]),

        function(g(_,_), [
			   0, 1,
			   0, 1 ]),

        function(F(_,_), [
			   0, 1,
			   0, 1 ]),

        relation(->*(_,_), [
			   1, 0,
			   0, 1 ]),

        relation(->(_,_), [
			   1, 0,
			   0, 1 ])
]).

============================== end of model ==========================

============================== STATISTICS ============================

For domain size 2.

Current CPU time: 0.00 seconds (total CPU time: 0.01 seconds).
Ground clauses: seen=74, kept=70.
Selections=44, assignments=78, propagations=77, current_models=1.
Rewrite_terms=850, rewrite_bools=558, indexes=202.
Rules_from_neg_clauses=19, cross_offs=19.

============================== end of statistics =====================

User_CPU=0.01, System_CPU=0.00, Wall_clock=0.

Exiting with 1 model.

Process 3187366 exit (max_models) Tue Jul 30 08:34:55 2024
The process finished Tue Jul 30 08:34:55 2024


Mace4 cooked interpretation:

% number = 1
% seconds = 0

% Interpretation of size 2

a = 0.

b = 1.

h(0) = 0.
h(1) = 1.

f(0,0) = 0.
f(0,1) = 0.
f(1,0) = 0.
f(1,1) = 0.

g(0,0) = 0.
g(0,1) = 1.
g(1,0) = 0.
g(1,1) = 1.

F(0,0) = 0.
F(0,1) = 1.
F(1,0) = 0.
F(1,1) = 1.

  ->*(0,0).
- ->*(0,1).
- ->*(1,0).
  ->*(1,1).

  ->(0,0).
- ->(0,1).
- ->(1,0).
  ->(1,1).


The problem is infeasible.