共查询到20条相似文献,搜索用时 0 毫秒
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This paper is devoted to a study and classification ofG-invariant convex cones ing, whereG is a lie group andg its Lie algebra which is simple. It is proved that any such cone is characterized by its intersection withh-a fixed compact Cartan subalgebra which exists by the very virtue of existence of properG-invariant cones. In fact the pair (g,k) is necessarily Hermitian symmetric. 相似文献
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In this paper, we give certain homotopy and diffeomorphism versions as a generalization to an earlier result due to W.S. Cheung,
Bun Wong and Stephen S. T. Yau concerning a local rigidity problem of the tangent bundle over compact surfaces of general
type. 相似文献
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Yuya Koda 《Topology and its Applications》2009,156(3):577-593
In the present paper we give a formula for colored Turaev-Viro invariants of twist knots using special polyhedra derived from (1,1)-decomposition of the knots. 相似文献
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Yoko Mizuma 《Topology and its Applications》2009,156(13):2292-2294
We compute the Casson invariant for some integral homology 3-spheres. We also show that for every integer n, there exists an integral homology 3-sphere of Mazur type with the Casson invariant 2n. 相似文献
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In this paper,for the purpose of measuring the non-self-centrality extent of non-selfcentered graphs,a novel eccentricity-based invariant,named as non-self-centrality number(NSC number for short),of a graph G is defined as follows:N(G)=∑v_i,v_j∈V(G)|e_i-e_j| where the summation goes over all the unordered pairs of vertices in G and e_i is the eccentricity of vertex v_i in G,whereas the invariant will be called third Zagreb eccentricity index if the summation only goes over the adjacent vertex pairs of graph G.In this paper,we determine the lower and upper bounds on N(G) and characterize the corresponding graphs at which the lower and upper bounds are attained.Finally we propose some attractive research topics for this new invariant of graphs. 相似文献
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This is a continuation of our previous work. We classify all the simple ?q(D n )-modules via an automorphismh defined on the set { λ | Dλ ≠ 0}. Whenf n(q) ≠ 0, this yields a classification of all the simple ? q (D n)- modules for arbitrary n. In general ( i. e., q arbitrary), if λ(1) = λ(2),wegivea necessary and sufficient condition ( in terms of some polynomials ) to ensure that the irreducible ?q,1(B n )- module Dλ remains irreducible on restriction to ?q(D n ). 相似文献
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Koichi Ogiue 《Annali di Matematica Pura ed Applicata》1968,80(1):387-397
Summary Theory of immersions satisfying the condition that tangent spaces to an immersed submanifold are invariant under the curvature
transformation. 相似文献
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M. G. Nadkarni 《Proceedings Mathematical Sciences》1990,100(3):203-220
A necessary and sufficient condition is given for a Borel automorphism on a standard Borel space to admit an invariant probability
measure. 相似文献
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A real square matrix A leaves a nontrivial convex set invariant if there exists a convex set C, which is not a linear subspace, such that A(C) ? C. It is shown that this is equivalent to the statement that A has an eigenvalue λ with λ?0 or |λ|?1. 相似文献
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Zbigniew Leśniak 《Journal of Difference Equations and Applications》2019,25(9-10):1363-1371
ABSTRACTWe present properties of equivalence classes of the codivergency relation defined for a Brouwer homeomorphism for which there exists a family of invariant pairwise disjoint lines covering the plane. In particular, using the codivergency relation we describe the sets of regular and irregular points for such Brouwer homeomorphisms. Moreover, we show that under this assumption the interior of each equivalence class of this relation is invariant and simply connected. 相似文献
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A. S. Voynov 《Mathematical Notes》2011,90(1-2):32-36
We give a complete characterization of finite-dimensional compact sets with the following property: all of their images under affine operators are symmetric (that is, have symmetry planes of certain dimensions). We also study the noncompact case; namely, we reveal a class of unbounded closed sets with this property and conjecture that this class is complete. 相似文献
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Augustin Banyaga 《Journal of Geometry》2000,68(1-2):10-15
We show that various conformal groups, including classical conformal diffeomorphism groups are essential. The essentiality is shown to be equivalent to the non-vanishing of a conformal cohomological invariant. 相似文献
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