G4 Prover
    
Result of the test for sequent p->q <--> ~p\/q 



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.
Trying to prove with threshold = 0 1 2 3 4 5
Fail to prove p->q --> ~p\/q (10 msec.)
Trying to prove with threshold = 0
Succeed in proving ~p\/q --> p->q (2 msec.)
pretty:1 =
----------- Lbot
bot,p --> q
-------------- L0->1
p,p->bot --> q
--------------- R->    --------- Ax
p->bot --> p->q        p,q --> q
--------------- L~def  ---------- R->
  ~p --> p->q          q --> p->q
  ------------------------------- L\/
          ~p\/q --> p->q
yes
fol(g4i)> quit.
yes
Exit from Sequent Calculus Prover...
Total CPU time = 14 msec.
true 


  

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Maintained by  Joseph Vidal-Rosset