| 期刊全称 | A Field Guide to Algebra | | 影响因子2023 | Antoine Chambert-Loir | | 视频video | | | 发行地址 | Has a nonstandard choice of topics, including material on differential galois groups and proofs of the transcendence of e and pi.The author uses a conversational tone and has included a selection of s | | 学科分类 | Undergraduate Texts in Mathematics | | 图书封面 |  | | 影响因子 | This is a small book on algebra where the stress is laid on the structure of ?elds, hence its title. Youwillhearaboutequations,bothpolynomialanddi?erential,andabout the algebraic structure of their solutions. For example, it has been known for centuries how to explicitely solve polynomial equations of degree 2 (Baby- nians, many centuries ago), 3 (Scipione del Ferro, Tartaglia, Cardan, around th 1500a.d.), and even 4 (Cardan, Ferrari,xvi century), using only algebraic operations and radicals (nth roots). However, the case of degree 5 remained unsolved until Abel showed in 1826 that a general equation of degree 5 cannot be solved that way. Soon after that, Galois de?ned the group of a polynomial equation as the group of permutations of its roots (say, complex roots) that preserve all algebraicidentitieswithrationalcoe?cientssatis?edbytheseroots.Examples of such identities are given by the elementary symmetric polynomials, for it is well known that the coe?cients of a polynomial are (up to sign) elementary symmetric polynomials in the roots. In general, all relations are obtained by combining these, but sometimes there are new ones and the group of the equation is smaller than the wh | | Pindex | Textbook 2005 |
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发表于 2025-3-21 16:11:37
