Algebraic k-theory by V. Srinivas PDF

By V. Srinivas

ISBN-10: 0817637028

ISBN-13: 9780817637026

ISBN-10: 0817647368

ISBN-13: 9780817647360

Algebraic K-Theory has turn into an more and more lively quarter of study. With its connections to algebra, algebraic geometry, topology, and quantity thought, it has implications for a wide selection of researchers and graduate scholars in arithmetic. The booklet is predicated on lectures given on the author's domestic establishment, the Tata Institute in Bombay, and in other places. a close appendix on topology used to be supplied within the first version to make the remedy obtainable to readers with a restricted history in topology. This re-creation additionally contains an appendix on algebraic geometry that includes the mandatory definitions and effects had to comprehend the center of the publication; this makes the ebook obtainable to a much broader audience.

A valuable a part of the publication is an in depth exposition of the guidelines of Quillen as contained in his vintage papers “Higher Algebraic K-Theory, I, II.” A extra ordinary facts of the concept of Merkujev--Suslin is given during this variation; this makes the remedy of this subject self-contained. An functions is additionally given to modules of finite size and finite projective measurement over the neighborhood ring of a regular floor singularity. those effects lead the reader to a couple fascinating conclusions in regards to the Chow staff of types.

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Let k' be the extension m field obtained by adjoining the ruth roots of all elements of k. By K u m m e r theory, we have an isomorphism k* | Z / m Z ~= H o m ( G a l ( k ' / k ) , pro), and by local class-field theory, we have an isomorphism Gal(k'/k) ~= k*/Nk,/k(k')* where Nk,/k is the norm (note that k l / k is a finite extension, since k* | Z / m Z is finite). Thus we have a pairing k* | k* ('); #m called the local ruth-power norm-residue symbol; one can check that it does indeed satisfy the conditions (i)-(iii) in the definition of a symbol.

In particular, if C is a small category with either an initial or a final object, then BC is contractible. 8). Let I be a small filtering category, and let {C~}~ez be a family of small categories indexed by I. Let t7 = li__mCi be the direct limit I category. Let X i ~ Ci be a family of objects such that X i 9 ; X j under 36 Algebraic K-Theory the transition functors C~ , Ci of the given family (corresponding to morphisms i --. j in 1), and let X ~ C be the common image of the X~. Then 7rn(BC, {X}) = li__m7rn(BCi, {Xi}) for all n > O.

O g and f, are conjugate by an element of GL(R). 13). /] f, g 9 G the induced maps f +, g+ 9 B G preserving the respective base points. G L ( R ) are pseudo-conjugate, then B G L ( R ) + are homotopic as maps P r o o f . For any map f : G ; GL(R), let f ~ 1 denote the map given by x ~-. f ( x ) ~ l , for any x E G. Then f + is homotopic to ( f ~ l ) +, preserving the base point, because f ~ 1 = (u0)~ o f , where u0 E M is defined by 0(i) = 2 i - 1. Now suppose the given maps f, g satisfy g = (u~ o f ) a for ~ e G L ( R ) (where ( u ~ ~(u~ -1 for a l l x e G).

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