An introduction to central simple algebras and their - download pdf or read online

By Grégory Berhuy

ISBN-10: 0821849379

ISBN-13: 9780821849378

Imperative basic algebras come up obviously in lots of parts of arithmetic. they're heavily attached with ring concept, yet also are very important in illustration conception, algebraic geometry and quantity concept. lately, striking functions of the idea of primary easy algebras have arisen within the context of coding for instant communique. The exposition within the publication takes benefit of this serendipity, offering an creation to the speculation of significant basic algebras intertwined with its functions to coding conception. Many effects or structures from the traditional concept are awarded in classical shape, yet with a spotlight on particular thoughts and examples, usually from coding thought. issues coated contain quaternion algebras, splitting fields, the Skolem-Noether Theorem, the Brauer staff, crossed items, cyclic algebras and algebras with a unitary involution. Code structures give the chance for lots of examples and particular computations. This ebook presents an creation to the idea of important algebras obtainable to graduate scholars, whereas additionally featuring issues in coding conception for instant verbal exchange for a mathematical viewers. it's also compatible for coding theorists drawn to studying how department algebras could be beneficial for coding in instant verbal exchange

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Extra info for An introduction to central simple algebras and their applications to wireless communication

Example text

Since the minimal polynomial of E11 is X(X − 1), we have B ∼ =k k × k. In particular, B is not simple. Moreover, we have dimk (B) = 2 dimk (A) = 9. 50 III. 3. Let A be a central simple k-algebra, and let L be a subfield of A of degree r over k. Then we have A ⊗k L ∼ =L Mr (CA (L)). Proof. Since L is a simple k-subalgebra of A and ZA (L) = L (since L is commutative), the last part of the Centralizer Theorem gives ∼L Mr (L ⊗L CA (L)). A ⊗k L = Since L ⊗L CA (L) ∼ =L CA (L), we are done. Exercises 1.

Proof. Assume that Mn (A) ∼ =k Mn (B). By Wedderburn’s theorem, we may write A∼ =k Ms (D ), where D, D are central division k-algebras. We =k Mr (D) and B ∼ then have Mnr (D) ∼ =k Mns (D ). By the uniqueness part of Wedderburn’s theorem, we have nr = ns and D ∼ =k D , which implies that A ∼ =k B. 3. If k is algebraically closed, every central simple k-algebra is isomorphic to a matrix algebra. Proof. By Wedderburn’s theorem, it is enough to prove that every central division k-algebra D is equal to k.

In this setting, a submodule is just a left (resp. right) ideal of R. (2) If R = k is a field, then an R-module is nothing but a k-vector space. (3) If M is a left (resp. right) R-module, so is M n for any n ≥ 1, an element a ∈ R acting componentwise. In particular, Rn is a left (resp. right) R-module for any n ≥ 1. (4) If I is a left ideal of R, the abelian group R/I has a natural left R-module structure, where the scalar multiplication is given by R × R/I −→ R/I (a, x) −→ a·x. The reader will check that this map is indeed well-defined.

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An introduction to central simple algebras and their applications to wireless communication by Grégory Berhuy


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