A simple proof of the Abel-Ruffini theorem

Details A simple proof of the Abel-Ruffini theorem A simple proof of the Abel-Ruffini theorem

2011-02-10

arxiv.org/abs/1102.2100v1

Mat. Prosveschenie, 15 (2011) 113-126

Mathematics

History and Overview

9 pages, 3 figures

Scientific paper

This paper is purely expositional. The statement of the Abel-Ruffini theorem on unsolvability of equations using radicals is simple and well-known. We sketch an elementary proof of this theorem. We do not use the terms 'field extension', 'Galois group' and even 'group'. However, our presentation is a good way to learn (or recall) starting idea of the Galois theory. Our exposition follows `Mathematical Omnibus' of S. Tabachnikov and D.B. Fuchs. The main difference is that we show how the proof could have been invented. The paper is accessible for students familiar with complex numbers, and could be an interesting easy reading for mature mathematicians. The material is presented as a sequence of problems, which is peculiar not only to Zen monasteries but also to advanced mathematical education; most problems are presented with hints or solutions.

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