منابع مشابه
Large and Small Group Homology
For several instances of metric largeness like enlargeability or having hyperspherical universal covers, we construct non-large sub-vectorspaces in the rational homology of finitely generated groups. The functorial properties of this construction imply that the corresponding largeness properties of closed manifolds depend only on the image of their fundamental classes under the classifying map....
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Small groups which form for teaching and learning process would have substantial outcomes if manage properly. Evidence suggests that environment and seating arrangement of the learners would have considerable impacts on the success of a facilitator to properly use from the dynamics of the group. The aim of the present article is therefore to discuss the appropriate environment and seating arran...
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In large quasilinear economies, we provide sufficient conditions to establish the nonemptiness of several versions of approximate interim cores with endogenous communication. This is done by proving nonemptiness of approximate ex post cores satisfying incentive compatibility. When the number of agents with private information remains finite, the main argument relies on an adaptation of the smal...
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Let G be a group and let X be a generating set for G. Let F be a free group with basis in one-to-one correspondence to X. The kernel of the canonical map F → G is denoted by R(G, X) and is called the relation subgroup associated with X. If we abelianize the group R = R(G, X), we obtain a ZG-module M(G, X) = R/[R, R], where the G-action is given by conjugation. This module is called the relation...
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This can be stated in a more symmetric manner. Let r be any positive integer not equal to 3. Then n acts freely and homologically trivially on Z r i ff n acts freely and homologically trivially on SL In fact, there is a one-to-one correspondence between such actions on U and such actions on S r. (The classification of such actions is discussed in w In addition the actions constructed have the p...
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ژورنال
عنوان ژورنال: Journal of Topology
سال: 2010
ISSN: 1753-8416
DOI: 10.1112/jtopol/jtq014