Lars Kempe

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We outline a methodology for the modular speciication of telephone services within rst-order linear-time temporal logic. Typically, the services ooered by a telephone system consist of a basic service and several optional additional services, such as automatic callback, redirection, etc. We argue informally that temporal logic provides a exible formalism(More)
A case of plasmacytoma of the clivus is presented. The patient was asymptomatic until a coincidental traumatic lesion produced manifestations of vagus nerve dysfunction. Conduction was blocked in some fibers of the vagus nerve while, at the same time, episodes of activity were triggered in fibers of the same nerve trunk, resulting in an unusual combination(More)
With the introduction of additional diagnostic methods, computerized axial tomography, interventricular tumors are discovered at a time when these lesions are still small and may have presented very insignificant or no clinical symptoms. If the lesion is a benign tumor as a meningioma and within the lateral ventricle of the dominant hemisphere a very(More)
We consider the problem of verifying correctness properties of a class of programs with states that are sets of ground atoms. Such programs can model speciications of telephone services, in which we are particularly interested. For this class of systems, we consider the problem of checking reachability properties. A large class of safety properties can also(More)
We consider the problem of verifying correctness properties of a class of programs with states that are sets of ground atoms. Such programs can model speciications of telephone services, in which we are particularly interested. For this class of systems, we consider the problem of checking reachability properties. A large class of safety properties can also(More)
That blood in the subarachnoid space could possibly produce hydrocephalus was first suggested by Bagley in 1928 (3, 4). His conclusions were based on both experimental and clinical studies even though he actually failed to demonstrate a communicating hydrocephalus. Subsequent workers have repeatedly demonstrated leptomeningeal thickening associated with(More)