Explicit Brauer induction by Victor P. Snaith PDF

By Victor P. Snaith

ISBN-10: 0521460158

ISBN-13: 9780521460156

Specific Brauer Induction is a brand new and demanding method in algebra, found through the writer in 1986. It solves an previous challenge, giving a canonical formulation for Brauer's induction theorem. during this ebook it truly is derived algebraically, following a mode of R. Boltje - thereby making the approach, formerly topological, available to algebraists. as soon as built, the process is used, in terms of representation, to re-prove a few very important recognized leads to new methods and to settle a few amazing difficulties. As with Brauer's unique consequence, the canonical formulation could be anticipated to have quite a few purposes and this publication is designed to introduce learn algebraists to its chances. for instance, the method offers a far better building of the Oliver-Taylor group-ring logarithm, which permits the writer to check extra successfully algebraic and number-theoretic questions hooked up with class-groups of jewelry.

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Example text

So we lose nothing by assuming that B is an l × r matrix and C is an r × l matrix, where r is a positive integer, in which case det BC is the unique l-minor of BC. 3, Question 4(d)). We now assume r ≥ l and let Y denote a subset of {1, 2, . . , r} having l elements; there are rl such subsets Y . Let BY denote the l × l submatrix of B obtained by deleting column j for all j ∈ / Y . Similarly let Y C denote the l × l submatrix of C obtained by deleting row j for all j ∈ / Y. To help the reader through the next proof we look first at the case l = 2, r = 3.

11 requires 3n + 1 elementary operations to reduce An to S(An ) = diag(1, an ) where n ≥ 3. Specify a sequence of four elementary operations which reduces An to its Smith normal form S(An ). 32 1. Matrices with Integer Entries: The Smith Normal Form 7. Let G denote the group of all pairs (P , Q) where P and Q are invertible s × s and t × t matrices respectively over Z, the group operation being componentwise multiplication. (a) Let D be an s × t matrix over Z. Verify that the ‘centraliser’ Z(D) = {(P , Q) ∈ G : P D = DQ} is a subgroup of G.

We are now ready to state and prove a general theorem which was discovered independently by the French mathematicians Binet and Cauchy in 1812. 18 (The Cauchy–Binet theorem over Z) Let B be an l × r matrix over Z and let C be an r × l matrix over Z where r ≥ l. For each subset Y of {1, 2, . . , r} having l elements, let BY be the l × l submatrix of B formed by deleting column j for all j ∈ / Y . Let Y C be the l × l submatrix of C formed by deleting row j for all j ∈ / Y . Then det BC = det BY det Y C.

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