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We study whether transition sequences that transform markings with multiples of a number k on each place can be separated into k sequences, each transforming one k-th of the original marking. We prove that such a separation is possible for marked graph Petri nets, and present an inseparable sequence for a free-choice net.
In 1969 the Second All-Soviet Programming Conference took place here, in Akademgorodok. One of the hot issues discussed at that conference was the problem of crisis of programming, which was proposed by Andrei Ershov. Indeed, programs were becoming bulky and complicated, and were swarming with errors; the programmer’s labor efficiency was thus low, and the development process hardly manageable. The...
Spec# is research programming system that aims to provide programmers with a higher degree of rigor than in common languages today. The Spec# language extends the object-oriented .NET language C#, adding features like non-null types, pre- and postconditions, and object invariants. The language has been designed to support an incremental path to using more specifications. Some of the new features of...
Verification of requirement specifications is an important stage of the software development process. Detection of inconsistency and incompleteness of requirement specifications, as well as discovering of wrong decisions at early stages of the design process decreases the cost of software quality. An approach to requirement verification has been considered in the papers [5-8]. The language of basic...
Formal methods traditionally aim at verifying and proving correctness (a typical academic activity), while testing can only show the presence of errors (that is what practitioners do). Recently, there is an increasing interest in the use of formal models and methods in testing. In this talk, we first present a traditional framework of model–based testing, considering a variety of state-oriented (automata)...
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