Ostrowski's theorem (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ostrowski's theorem" in English language version.

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springer.com

Koblitz, Neal (1984). P-adic numbers, p-adic analysis, and zeta-functions. Graduate Texts in Mathematics (2nd ed.). New York: Springer-Verlag. p. 3. ISBN 978-0-387-96017-3. Retrieved 24 August 2012. Theorem 1 (Ostrowski). Every nontrivial norm ‖ ‖ on $\mathbb {Q}$ is equivalent to $| | p$ for some prime $p$ or for $p = \infty$ .