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- W1726672202 abstract "The idea of p -adic numbers is due to Hensel, who was inspired by local power series expansions of meromorphic functions (see Warner 1989 p. 469f, Ebbinghaus et al. 1991 Chapter 6 and Ullrich 1998). We treat the p -adic numbers as relatives of the real numbers. In fact, completion of the rational field ℚ with respect to an absolute value leads either to the reals ℝ or to a field ℚ p of p -adic numbers, where p is a prime number (see 44.9, 44.10, 51.4, 55.4), and these fields are locally compact. We consider the additive and the multiplicative group of ℚ p in Sections 52 and 53, and we study squares and quadratic forms over ℚ p in Section 54. It turns out (see 53.2) that the additive and the multiplicative group of ℚ p are locally isomorphic, in the sense that some open (and compact) subgroup of ℚ × p is isomorphic to an open subgroup of ℚ + p ; this is similar to the situation for ℝ. Comparing ℝ and ℚ p , it appears that the structure of ℚ p is dominated much more by algebraic and number theoretic features. A major topological difference between the locally compact fields ℝ and ℚ p is the fact that ℝ is connected and ℚ p is totally disconnected (51.10). Moreover, ℚ p cannot be made into an ordered field (54.2). In Sections 55–58 we put the fields ℚ p in the context of general topological fields: we study absolute values, valuations and the corresponding topologies. Section 58 deals with the classification of all locally compact fields and skew fields." @default.
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- W1726672202 date "2010-06-02" @default.
- W1726672202 modified "2023-09-25" @default.
- W1726672202 title "The p-adic numbers" @default.
- W1726672202 doi "https://doi.org/10.1017/cbo9780511721502.006" @default.
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