Disprover: Difference between revisions

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or proofs for a given proof obligation.
or proofs for a given proof obligation.


The Disprover is described in [http://www.stups.uni-duesseldorf.de/publications_detail.php?id=219 Debugging Event-B Models using the ProB Disprover Plug-in], Ligot, Bendisposto, Leuschel.
An early version of the ProB Disprover is described in [http://www.stups.uni-duesseldorf.de/publications_detail.php?id=219 Debugging Event-B Models using the ProB Disprover Plug-in], Ligot, Bendisposto, Leuschel.
 
Recently, the Disprover has been extended to detect cases in which the search for a counter-example was complete, yet there was no result. In this cases, the absence of a counter-example will be reported as a proof.
See [http://stups.hhu.de/w/Special:Publication/disprover_eval the paper describing the disprover as a prover] for more details.


== Installation ==
== Installation ==
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== How to use it, how it works ==
== How to use it, how it works ==


[[Image:disprover-all.png]]: The proof obligation editor in Rodin presents the user with a number of Hypotheses and one Goal, to be proved. If the Disprover is installed, it is available in the tool bar alongside the other provers.
[http://www.prob2.de/Tutorial_Disprover Disprover Tutorial]
 
Upon selecting the Disprover, it builds a formula from the Hypotheses and the negated Goal.  The ProB model checker then tries to find a model for that formula.  If that is possible, this model is a counter example that will be presented back to the user in the proof tree. The disprover also checks if there cannot be a model for the formula. If this is the case it acts like a decision procedure, i.e., absence of a model is a proof for the goal. Unfortunately, sometimes neither a counter example nor a proof can be found.
 


[[Category:User documentation]]
[[Category:User documentation]]

Latest revision as of 13:34, 2 May 2016

ProB Disprover

The ProB Disprover plugin for RODIN utilizes the ProB animator and model checker to automatically find counterexamples or proofs for a given proof obligation.

An early version of the ProB Disprover is described in Debugging Event-B Models using the ProB Disprover Plug-in, Ligot, Bendisposto, Leuschel.

Recently, the Disprover has been extended to detect cases in which the search for a counter-example was complete, yet there was no result. In this cases, the absence of a counter-example will be reported as a proof. See the paper describing the disprover as a prover for more details.

Installation

The ProB Disprover is currently only available through the ProB Nightly Build Update Site (http://nightly.cobra.cs.uni-duesseldorf.de/rodin/updatesite/).


How to use it, how it works

Disprover Tutorial