NAME

       checkproof - manual page for checkproof 2.6

SYNOPSIS

       checkproof [options] [files]

DESCRIPTION

       checkproof 2.6

       Read  an  UPCL2  protocol  and  verify  the  inferences  using one of a varity of external
       provers.

       This is  a  _very_  experimental  program.  Passing  checkproof  does  indicate  that  all
       inferences in an UPCL2 protocol are correct (i.e. that the conclusion is logically implied
       by the premisses) - that is, if you believe that the transformation process and  the  used
       prover  are  correct.  However,  checkproof  will  e.g.  gladly  show that the empty proof
       protocol does not contain any buggy steps.

       If a proof protocol fails to pass this test, the proof may still be correct. Due  to  e.g.
       incomplete  strategies (this applies in particular to Otter), build-in limits (Otter), and
       bugs in the prover (potentially all systems, but observed in SPASS 0.55), a  prover  might
       fail  to verify a correct step. Moreover, due to the different strategies, calculi, and in
       particular different term orderings chosen by the systems, a single  UPCL2  inference  may
       result  in  a  proof  problem that is very hard to verify for other provers. However, if a
       proof step is rejected by more than one system, you should probably look at this  step  in
       detail.

       Options

       -h

       --help

              Print a short description of program usage and options.

       --version

              Print the version number of the program.

       -v

       --verbose[=<arg>]

              Verbose  comments  on  the progress of the program. The short form or the long form
              without the optional argument is equivalent to --verbose=1.

       -o <arg>

       --output-file=<arg>

              Redirect output into the named file.

       -s

       --silent

              Equivalent to --output-level=0.

       -l <arg>

       --output-level=<arg>

              Select an output level, greater values imply more verbose output.  At  the  moment,
              level  0  only  prints  the  result,  level  1  prints  inference steps as they are
              verified, level 2 prints prover commands issued, and  level  3  prints  all  prover
              output (which may be very little)

       -p <arg>

       --prover-type=<arg>

              Set  the  type  of  the  prover  to  use for proof verification. Determines problem
              syntax, options,  and  check  for  success.  Supported  options  at  are  'E'  (the
              default),'Otter'  'SPASS', and 'scheme-setheo' (not yet implemented). SPASS support
              is only tested with SPASS 0.55 and may fail if  the  problem  contains  identifiers
              reserved by SPASS. There have been some supple syntax changes, so more recent SPASS
              versions will probably fail as well.

       -x <arg>

       --executable=<arg>

              Give the name under which the prover can be called.  If  no  executable  is  given,
              checkproof will guess a name based on the type of the prover. This guess may be way
              off!

       -t <arg>

       --prover-cpu-limit=<arg>

              Limit the CPU time prover may spend on a single step. Default is 10 seconds.

REPORTING BUGS

       Report bugs to <schulz@eprover.org>. Please include the following, if possible:

       * The version of the package as reported by eprover --version.

       * The operating system and version.

       * The exact command line that leads to the unexpected behaviour.

       * A description of what you expected and what actually happened.

       * If possible all input files necessary to reproduce the bug.

COPYRIGHT

       Copyright 1998-2021 by Stephan Schulz, schulz@eprover.org, and  the  E  contributors  (see
       DOC/CONTRIBUTORS).

       This  program  is  a  part of the distribution of the equational theorem prover E. You can
       find the latest version of the  E  distribution  as  well  as  additional  information  at
       http://www.eprover.org

       This program is free software; you can redistribute it and/or modify it under the terms of
       the GNU General Public License as  published  by  the  Free  Software  Foundation;  either
       version 2 of the License, or (at your option) any later version.

       This  program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE.
       See the GNU General Public License for more details.

       You  should have received a copy of the GNU General Public License along with this program
       (it should be contained in the top  level  directory  of  the  distribution  in  the  file
       COPYING); if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
       Boston, MA  02111-1307 USA

       The original copyright holder can be contacted via email or as

       Stephan Schulz  DHBW  Stuttgart  Fakultaet  Technik  Informatik  Rotebuehlplatz  41  70178
       Stuttgart Germany