APAV - Academy of Sciences, Letters, Arts and Technology (E-Journals)
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Un esempio di ipergruppo ottenuto mediante combinazioni lineari.
No full textThis paper is the summary of a conversation that took place at the Politccnico of Milan during a seminar in which we wanted to give examples of hypergroups by means of elementary structures. This is the reason why the example of wipergroup is presented by means of a vectorial space or a real variable, instead of utilizing a more general form suggested in h four
Attuali sviluppi nello studio dell’associazione tra variabili di tipo qualitativo.
No full textThe most common procedure for analyzing contingency table data is by using chi-square statistic. The early development of chi-square analysis of contingency table is credited to Pearson (1904) and Fisher (1929), successively expanded by Yates, Mantel-Haenszcl etc. In this paper some developments of the chi-square function has been outlined, particularly as statistical test for the null hypothesis of independence, for subdividing contingency tables and the chi-square test for linear association between ordinal variables
WHAT IS INSIDE A PROBABILISTIC EXPERT SYSTEM
No full textThis paper is an outline of how a probabilistic expert system works, therefore the theoretical details have been omitted. They have been widely dealt with e. g. in the quoted references. The framework is the one of de Finetti’s theory. His fundamental theorem allows us to consider at first only the probability distribution on some of the events of interest and then, when new information gets into the system, to extend to other conditional events in a coherent way. Five examples that consider several typical situations one can come up against are illustrated. They allows us to have a general understanding of how a probabilistic expert system works
PERIODIC SOLUTIONS OF A SECOND ORDER EVOLUTIVE VARIATIONAL INEQUALITY
No full textHereafter we shall analyse the existence and regularity properties of the solution of the periodic problem related to a second order evolutive variational inequality
SISTEMI DIGITALI MULTICANALE E TEORIA DELL'INFORMAZIONE I. ENTROPIA, RIDONDANZA E CODIFICA
No full textThe possibility of applications of the Information Theory to the Multichannel Digital Systems (SDM) Theory has been analyzed
PRACTICAL ASPECTS IN SOME NOT CLASSICAL METHODS FOR THE NUMERICAL EVALUATION OF CPV- INTEGRALS
No full textTwo different not classical approaches are given for the numerical evaluation of weighted Cauchy principal value integrals, The first approach is an interpolatory Gaussian integration over the unit half disc.The second method is a quasi interpolatory integration rule based on spline approximation
SU UNA CLASSE DI MODELLI MATEMATICI PER L'URBANISTICA
No full textIn this paper a two parameter general mathematical model for the urbanistic applications is considered. The exponentiai and gravitatiaaai models are very particular cases, We examine the properties of the model with all the possible values of the parameters. Therefore we assign the most general mathematical properties that we think must be satisfied by the mathematical models concerning the people flows
A RECURSIVE ALGORITHM SUITABLE FOR REAL-TIME MEASUREMENT
No full textThis paper deals with a recursive algorithm suitable for realtime measurement applications, based on an indirect technique, useful in those applications where the required quantities cannot be measured in a straightforward way. To cope with time constraints a parallel formulation of it, suitable to be implemented on multiprocessor systems, is presented. The adopted concurrent implementation is based on factorization techniques. Some experimental results related to the application of the system for carrying out measurements on synchronous motors are included
QUASI-CONCAVITY PROPERTY OF MULTIVARIATE DISTRIBUTION FUNCTIONS
No full textConditions under which multivariate distribution functions are quasi-concave, are explored. We prove that many elliptically contoured distributions have quasi-concave distribution functions. By some characterisations of the copula, further classes are provided. A few probability inequalities are also suggested