Abstract
We consider field extensions which are generated by all zeros of a given polynomial over a field containing its coefficients. Such a field is called a splitting field. Splitting fields of polynomials play a central role in Galois theory. It is intuitively clear that a splitting field of a polynomial is a very natural object carrying a lot of information about it. We will find a confirmation of this in the following chapters, in particular, when we come to the main theorems of Galois theory (Chap. 9) and its applications in subsequent chapters (e.g. in Chap. 13, where we study the solvability of equations by radicals). As an important example, we study finite fields in this chapter. These can be easily described as splitting fields of very simple polynomials over finite prime fields. We further consider the notion of an algebraic closure of a field K, which is a minimal field extension of K, containing a splitting field of every polynomial with coefficients in K.
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- 1.
Leopold Kronecker, 7 December 1823–29 December 1891.
- 2.
Eliakim Hastings Moore, 26 January 1862–30 December 1932.
- 3.
August Ferdinand Möbius, 17 November 1790–26 September 1868.
- 4.
Leonhard Euler, 15 April 1707–18 September 1783.
- 5.
Alfredo Capelli, 5 August 1855–28 January 1910.
References
A. Schinzel, Polynomials with Special Regard to Reducibility, Encyclopedia of Mathematics and its Applications 77, Cambridge University Press, 2000.
N.G. Tschebotaröw, Grundzüge der Galois’schen Theorie, H. Schwerdtfeger (ed.), P. Noordhoff, 1950.
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Brzeziński, J. (2018). Splitting Fields. In: Galois Theory Through Exercises. Springer Undergraduate Mathematics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72326-6_5
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DOI: https://doi.org/10.1007/978-3-319-72326-6_5
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