Alexander Ostrowski was a Ukrainian-born mathematician, born in Kiev (now Kyiv) on 25 September 1893 and dying in Montagnola near Lugano, Switzerland on 20 November 1986, who worked on a wide variety of topics in both analysis and algebra. As a schoolboy he attended the seminar of D A Grave in Kiev, and he had already found original results on Galois fields and written his first paper by the time he finished the School of Commerce in 1911. Theorems on valuations, determinants and inequalities carry his name.
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Source Alexander Ostrowski, Biography (MacTutor History of Mathematics)
Source Alexander Ostrowski, Biography (MacTutor History of Mathematics)
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Source Ostrowski's Theorem (Wikipedia)
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Source Alexander Ostrowski, Biography (MacTutor History of Mathematics)SummaryQuote, Summary
Alexander Ostrowski was a Ukrainian-born mathematician who worked on a wide variety of topics in both analysis and algebra.
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1. Alexander Ostrowski, Biography (MacTutor History of Mathematics)
SummaryQuote, Summary
Alexander Ostrowski was a Ukrainian-born mathematician who worked on a wide variety of topics in both analysis and algebra.
Ostrowski's Theorem (Wikipedia)
Wikimedia FoundationProofs Credited: Ostrowski's Theorem, Lead sectionQuote, Proofs Credited: Ostrowski's Theorem, Lead section
In number theory, Ostrowski's theorem, due to Alexander Ostrowski (1916), states that every non-trivial absolute value on the rational numbers Q {\displaystyle \mathbb {Q} } is equivalent to either the usual real
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