NAME

SYNOPSIS

DESCRIPTION

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

* 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 happend.

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

COPYRIGHT

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