Download Advances in Hopf algebras (p. 326 missing) by Jeffrey Bergen, Susan Montgomery PDF

By Jeffrey Bergen, Susan Montgomery

This amazing reference covers themes akin to quantum teams, Hopf Galois conception, activities and coactions of Hopf algebras, wreck and crossed items, and the constitution of cosemisimple Hopf algebras.

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Advances in Hopf algebras (p. 326 missing)

This extraordinary reference covers subject matters reminiscent of quantum teams, Hopf Galois idea, activities and coactions of Hopf algebras, break and crossed items, and the constitution of cosemisimple Hopf algebras.

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Example text

Find mβ,Q . 4 Suppose that X 3 + X is associated to an algebraic number α, but X 2 is not. Find mα,Q . Is α determined uniquely, that is, is there a single algebraic number α with these properties? 5 Suppose that X 5 + 2X 3 + X 2 + X + 1 is associated to an algebraic number α, but X 4 + 2X 2 + 1 is not. Find mα,Q . Is α determined uniquely? 6 Cite an appropriate theorem in order to deduce that to any given monic, irreducible polynomial in Q[X ] there exists an algebraic number to which it is associated.

6. 1 (Algebraic Number). An algebraic number α is a complex number α ∈ C such that there exists a polynomial 0 = p ∈ Q[X ] with p(α) = 0. Such polynomials p are said to be associated to α. As mentioned in the introduction, the set of algebraic numbers provides a good context in which to study certain numbers encountered in secondary school: rational numbers, √ √ 3 such as 3/7, and their integral roots, such as 2 7 and 14. These numbers are certainly roots of polynomials with rational coefficients, namely, X − (3/7), X 2 − 7, and X 3 − 14.

47 Proof. First observe that K (α) is precisely the field generated by α over the field K (β), as follows. Since β ∈ K (α) = K [α], K (β) ⊂ K [α]. 6). 9). In what follows, we will see the dimension of K (α) over K in two pieces: the dimension of K (α) over the subfield K (β) and the dimension of K (β) over K . We claim first that [K (α) : K (β)] must be finite. The polynomial mα,K (X ) ∈ K [X ] ⊂ K (β)[X ] is associated to α and has finite degree, say n. ), so deg K (β) (α) ≤ deg K (α). Let {γ1 , γ2 , .

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