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Central extensions of reductive groups by K2

✍ Scribed by Jean-Luc Brylinski; Pierre Deligne


Publisher
Springer
Year
2001
Tongue
English
Weight
515 KB
Volume
94
Category
Article
ISSN
0073-8301

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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