共查询到20条相似文献,搜索用时 15 毫秒
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By studying the action of the Weyl group of a simple Lie algebra on its root lattice, we construct torsion free subgroups
of small and explicitly determined index in a large infinite class of Coxeter groups. One spin-off is the construction of
hyperbolic manifolds of very small volume in up to eight dimensions. 相似文献
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Let G be a closed, additive semigroup in a Hausdorff topological vector space. Then G is a group if and only if it satisfies natural convexity conditions of algebraic or geometric-topological type. This yields
a characterization of the geometric lattices among the discrete, additive semigroups of Euclidean d-space
\mathbbEd{\mathbb{E}^{d}} and, more generally, of direct sums of subspaces and lattices in
\mathbbEd{\mathbb{E}^{d}}. 相似文献
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Gábor Czédli 《Algebra Universalis》2014,72(3):225-230
Recently, G. Grätzer has raised an interesting problem: Which distributive lattices are congruence lattices of slim semimodular lattices? We give an eight element slim distributive lattice that cannot be represented as the congruence lattice of a slim semimodular lattice. Our lattice demonstrates the difficulty of the problem. 相似文献
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In an earlier paper, we constructed all finite, planar, semimodular lattices in three simple steps from the direct product
of two finite chains. In this note we prove that one of the three steps can be eliminated.
The research of the first author was supported by the NSERC of Canada. 相似文献
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R. K. Raina 《Proceedings Mathematical Sciences》1991,101(3):179-181
The purpose of the present paper is to establish a connection theorem involving the multidimensional Weyl fractional operator
and the classical multidimensional Laplace transform. This provides an extension of a result due to Raina and Koul [6]. 相似文献
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Hiroshi Nozaki 《Archiv der Mathematik》2006,86(3):226-230
We prove that the theta series of any odd unimodular Euclidean lattice is not congruent to 1 modulo any odd prime p.
Received: 18 March 2005 相似文献
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Branimir Šešelja 《Discrete Mathematics》2008,308(10):2054-2057
It is proved that a codistributive element in an atomistic algebraic lattice has a complement, implying that kernels of the related homomorphisms coincide. Some applications to weak congruence lattices of algebras are presented. In particular, necessary and sufficient conditions under which the weak congruence lattice of an algebra is atomistic are given. 相似文献
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Tong Liu 《Mathematische Annalen》2010,346(1):117-138
Let p be a prime, K a finite extension over
\mathbb Qp{{\mathbb Q}_p} and G = Gal([`(K)] /K){G = {\rm Gal}(\overline K /K)} . We extend Kisin’s theory on j{\varphi} -modules of finite E(u)-height to give a new classification of G-stable
\mathbb Z1p{{\mathbb Z}1_p} -lattices in semi-stable representations. 相似文献
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