Galois group


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Galois group

[′gal‚wä ‚grüp]
(mathematics)
A group of isomorphisms of a particular field extension associated with a polynomial's roots.
References in periodicals archive ?
The group [G.sub.P] = Gal(C(C)/[K.sub.P]) is called the Galois group at P.
Their cohomology carries actions both of a linear algebraic group (such as gln) and a galois group associated with the number field one is studying.
The main result of this theory merely says that if a Hamiltonian system is completely integrable, then the identity component of the Galois group of the variational equation along certain particular solution is abelian.
If K [??] E is a finite Galois field extension and G is its Galois group, then the opposite category of K-algebras A with E [[cross product].sub.K] A [approximately equal to] [E.sup.n] for some natural n is equivalent to the category of finite G-sets.
(Hilbert's Theorem 90) Let F' be a finite extension of F whose Galois group G is cyclic generated by [sigma].
In section 3 we give our proof of the "if" part of theorem 1.1 by examining the Galois group of a suitable extension of Q(i).
Conversely, every irreducible parabolic subgroup of rank k - 1 in [A.sub.n] is the Galois group of some subspace in the k-equal arrangement.
The aim of this paper is to study the Galois group of a certain factor of a 4-th dynatomic polynomial.
First of all, [S.sub.n] is canonically a profinite group, and Gal [equivalent to] Gal([F.sub.[p.sup.n]]/[F.sub.p]), the Galois group of automorphisms of [F.sub.[p.sup.n]], acts continuously in an evident way on [S.sub.n].
then the Galois group [G.sub.P] of the splitting field of P(x) over Q is of order at most 132.
On this basis rests the subsequent discussion of polynomials and their Galois groups and representations of the Galois group, followed by the reciprocity laws, including the famous proof by Andrew Wiles of Fermat's Last Theorem.
All of the examples are division algebra representatives of algebras of the form A [cross product] [delta]([chi]), where A is a k-division algebra and [delta]([chi]) is the cyclic k(t) or k((t))-division algebra defined by a character [chi] of the absolute Galois group of k.