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Jean-Philippe Préaux 《Topology》2006,45(1):171-208
The aim of this paper is to show that the fundamental group of an oriented 3-manifold which satisfies Thurston's geometrization conjecture has a solvable conjugacy problem. In other words, for any such 3-manifold M, there exists an algorithm which can decide for any couple of elements u,v of π1(M) whether u and v are in the same conjugacy class of π1(M) or not. More topologically, the algorithm decides for any two loops in M, whether they are freely homotopic or not. 相似文献
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This paper presents an original method of analyzing radiation loss from dielectric slab with random wall imperfections. The method is based on Maxwell’s equations under their covariant form written in a non-orthogonal coordinate system. The solution is found by using a perturbation method applied to the smooth surface problem. The statistical characteristics of the radiation intensity, the average value and the probability density function, are analytically determined. 相似文献