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2.00 pm, NKN Hall The Power of Priority Channel Systems Philippe Schnoebelen CNRS and ENS Cachan, France. 25-02-14 Abstract We introduce Priority Channel Systems, a new class of channel systems where messages carry a numeric priority and where higher-priority messages can supersede lower-priority messages preceding them in the fifo communication buffers. The decidability of safety and inevitability properties is shown via the introduction of a priority embedding, a well-quasi-ordering that has not previously been used in well-structured systems. We show how Priority Channel Systems can compute Fast-Growing functions and prove that the aforementioned verification problems are F_{\epsilon_{0}}-complete.
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