By Holger Pfeifer (auth.), Tommaso Bolognesi, Diego Latella (eds.)

th The 20 anniversary of the IFIP WG6. 1 Joint foreign convention on Fonna! tools for dispensed structures and verbal exchange Protocols (FORTE XIII / PSTV XX) used to be celebrated via the yr 2000 version of the convention, which used to be held for the 1st time in Italy, at Pisa, October 10-13, 2000. In devising the subtitle for this distinct version --'Fonna! equipment­ Implementation below try' --we desired to express major options that, in our opinion, are mirrored within the contents of this e-book. First, the early, pioneering stages within the improvement of Formal equipment (FM's), with their conflicts among evangelistic and agnostic attitudes, with their over­ confident purposes to toy examples and over-skeptical perspectives approximately scalability to commercial circumstances, with their misconceptions and myths . . . , all this is often primarily over. Many FM's have effectively reached their adulthood, having been 'implemented' into concrete improvement perform: a few papers during this ebook record approximately profitable stories in specifYing and verifYing genuine dispensed platforms and protocols. moment, one of many a number of myths approximately FM's - the truth that their adoption could ultimately cast off the necessity for checking out - continues to be relatively faraway from changing into a fact, and, back, this e-book shows that checking out conception and functions are nonetheless remarkably fit. a complete of sixty three papers were submitted to FORTEIPSTV 2000, out of which the Programme Committee has chosen 22 for presentation on the convention and inclusion within the Proceedings.

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Additional resources for Formal Methods for Distributed System Development: FORTE / PSTV 2000 IFIP TC6 WG6.1 Joint International Conference on Formal Description Techniques for Distributed Systems and Communication Protocols (FORTE XIII) and Protocol Specification, Testing and Ve

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Does not hold. However it is possible to extract an interesting fragment of the Modal Mu-Calculus for which (under some particular restrictions) it is possible to guarantee the validity of the assertion Furtheron, a fragment for which the assertion holds will be presented. In Section 2 we present a TCSP-like process calculus which contains an operator for syntactic action refinement. The concept of logical refinement for the Modal Mu-Calculus is defined in Section 3. Section 4 provides the link between those two refinement concepts and contains the main results as well as their applications to system verification.

X(a) := (/) and X( (Pl IIAP2)) := X(Pl ) U X(P2) UA. A term P l E RL:, is called e-disjoint from a term P2 E RL:, iff e(Pd n e(P2) = 0. A term Pl E RL:, is called xe-disjoinf> from a term P2 E RL:, iff x(Pl ) n e(P2) = 0. A term P l E RL:, is called alphabet-disjoint from a term P2 E RL:, iff it is e-disjoint and xe-disjoint from P2. A term PERL:, is called uniquely synchronized iff for all terms (Pl IIAP2) that occur in P, A = X(Pi) holds for i = 1,2. To give a meaning to refined terms Pla "-+ QJ, we make use of a reduction function red : RL:, -+ L:, that removes all occurrences of refinement 4 Action variables will be used later to define the refinement of formulas (d.

Packet k is acknowledged by sending a request for packet k + 1. Typically, transmitted data is kept on a retransmission buffer until it has been acknowledged. Thus, when k is acknowledged, packets with sequence number less than or equal to k are removed from the retransmission buffer. Packets that are not acknowledged are eventually retransmitted. For our modeling of the sliding window protocol we assume that sequence numbers are unbounded, we do not assume that the channels are FIFO. Below we present two lOA versions of the sliding window protocol.

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