227 research outputs found

    Categoricity and Negation. A Note on Kripke’s Affirmativism

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    We argue that, if taken seriously, Kripke's view that a language for science can dispense with a negation operator is to be rejected. Part of the argument is a proof that positive logic, i.e., classical propositional logic without negation, is not categorical

    On the dimension of the space of integrals on coalgebras

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    We study the injective envelopes of the simple right CC-comodules, and their duals, where CC is a coalgebra. This is used to give a short proof and to extend a result of Iovanov on the dimension of the space of integrals on coalgebras. We show that if CC is right co-Frobenius, then the dimension of the space of left MM-integrals on CC is ≀dimM\leq {\rm dim}M for any left CC-comodule MM of finite support, and the dimension of the space of right NN-integrals on CC is ≄dimN\geq {\rm dim}N for any right CC-comodule NN of finite support. If CC is a coalgebra, it is discussed how far is the dual algebra C∗C^* from being semiperfect. Some examples of integrals are computed for incidence coalgebras

    SENSOR ARRAY ABLE TO DETECT AND RECOGNISE CHEMICAL WARFARE AGENTS

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    In this paper we studied a device based on array of six different sensors with surface acoustic wave for detections and recognition of three chemical warfare agents (chloropicrin, soman and lewisite). The sensors are “delay line” type with a center frequency of 69.4 MHz. It presents an original algorithm to identify the nature and concentration of gas from a finite range of possible gases. Numerical program developed to implement this algorithm, provides to operators all the particulars of gas and an indicator of credibility of the results provided as a measure of the degree of disturbance of the signals received from sensors.SAW, chemical warfare agent, array of sensors, algorithm

    Existence for elastodynamic Griffith fracture with a weak maximal dissipation condition

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    We consider a model of elastodynamics with fracture evolution, based on energy-dissipation balance and a maximal dissipation condition. We prove an existence result in the case of planar elasticity with a free crack path, where the maximal dissipation condition is satisfied among suitably regular competitor cracks

    Elastodynamic Griffith fracture on prescribed crack paths with kinks

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    We prove an existence result for a model of dynamic fracture based on Griffith\u2019s criterion in the case of a prescribed crack path with a kink
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