# G4 Prover

### Result of the test for sequent (~p-> ~q)-->((~p->q)->p)

G4 Prover: a Prolog Prover for Roy Dyckhoff's Sequent Calculus G4
This prover is a fork made by Joseph Vidal-Rosset (joseph.vidal-rosset@gmail.com),
from seqprover.pl, the sequent prover for CL-X, written by Naoyuki Tamura (tamura@kobe-u.ac.jp).
Type "help." if you need some help.
fol(g4i)> fol(g4i).
yes
fol(g4i)> output(pretty).
yes
fol(g4i)> ~p-> ~q-->(~p->q)->p.
Trying to prove with threshold = 0 1 2 3 4 5
Fail to prove ~p-> ~q --> (~p->q)->p (51 msec.)
yes
fol(g4i)> quit.
yes
Exit from Sequent Calculus Prover...
Total CPU time = 52 msec.
true