ProB Disprover Sample Clauses

ProB Disprover. Currently the constraint based invariant and deadlock checker is run from within the ProB plug-in and not from the prover interface on individual proof obligations. Indeed, for invariant preservation the disprover thus checks an event for all invariants, rather than being applied on individual proof obligations related to that event. However, ProB does know which invariants have already been proven to be preserved by that particular event. The rationale for running the invariant preservation checks in this way is that: • the counterexample is a full valuation of the models variables and constants which can be displayed using the ProB interface, • the invariants and guards truth values can be inspected in detail using the ProB interface, make the counter-example intelligible to the user, • ProB can find out which of the axioms are theorems and ignore them. Indeed in the old ProB disprover approach all of the assumptions were fed, and ProB did not know which ones are relevant to find correct values for the constants and variables. In fact, some of the theorems turned out to be very complicated to check, and prevented ProB from finding counterexamples. Similarly, the constraint-based deadlock checker is run from the ProB plug-in on a loaded model. As Xxxxx does not currently generate the deadlock freedom proof obligations, this was an obvious choice. Also, it enables the user to type in additional predicates to find "particularly interesting" counter examples (see ICLP'2011 article below[9]). Also, another advantage is that, again, the counter example can be inspected using the ProB interface.
Sample 1
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