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On relatively aspherical presentations and their central extensions

✍ Scribed by O. V. Kulikova


Book ID
106434494
Publisher
Springer US
Year
2007
Tongue
English
Weight
153 KB
Volume
142
Category
Article
ISSN
1573-8795

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We characterize the universal central extension of a perfect precrossed module giving two descriptions, one in terms of non-abelian tensor products of groups and other in terms of projective presentations. As application to relative algebraic K-theory, we obtain that Milnor's absolute and relative K