Interpretability into Lukasiewicz algebras
In this paper we give a characterization of all the interpretations of the varieties of bounded distributive lattices, De Morgan algebras and Lukasiewicz algebras of order m in the variety of Lukasiewicz algebras of order n. In the case of distributive lattices we give a structure theorem that is generalized to De Morgan algebras and to Lukasiewicz algebras of order m. In the last two cases we also give the number of such interpretations.
Lukasiewicz-Moisil algebras
Lattices, Universal Algebra and Categories. Topological Dualities in Lattice Theory. Elementary Properties of Lukasiewicz-Moisil Algebras. Connections with Other Classes of Lattices. Filters, Ideals and nu-Congruences. Representation Theorems and Duality for Lukasiewicz-Moisil Algebras. Categorical Properties of Lukasiewicz-Moisil Algebras. Monadic and Polyadic Lukasiewicz-Moisil Algebras. Lukasiewicz Logics. Appendix: Applications to Switching Theory. References. Author Index. Subject Index.
A new method of near field analysis
The problem of the accurate determination of the total electromagnetic field produced by a current distribution on a circular disc type aperture is examined. For comparison of the near and Fresnel region solutions, an exact Maxwellian integral is used as the starting point. Aperture and space coordinates are separated by the use of Bessel function addition theorems, allowing the field to be expressed as a sum of terms containing radial and angular integrals. The radial integrals involve only the disc (aperture) distribution and coordinates while the angular integrals involve only the elevation angle. The distance from origin appears implicitly in the series coefficients. These integrals are suitable for high speed computations and have been evaluated for a number of cases. The results are compared with the small angle and general Fresnel formula values for various observation angles, distances from the aperture, and aperture distributions.