Displaying similar documents to “A note on a generalization of the Sturm-Picone theorem”

Introduction to Liouville Numbers

Adam Grabowski, Artur Korniłowicz (2017)

Formalized Mathematics

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The article defines Liouville numbers, originally introduced by Joseph Liouville in 1844 [17] as an example of an object which can be approximated “quite closely” by a sequence of rational numbers. A real number x is a Liouville number iff for every positive integer n, there exist integers p and q such that q > 1 and [...] It is easy to show that all Liouville numbers are irrational. Liouville constant, which is also defined formally, is the first transcendental (not algebraic) number....

The Sturm-Liouville Friedrichs extension

Siqin Yao, Jiong Sun, Anton Zettl (2015)

Applications of Mathematics

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The characterization of the domain of the Friedrichs extension as a restriction of the maximal domain is well known. It depends on principal solutions. Here we establish a characterization as an extension of the minimal domain. Our proof is different and closer in spirit to the Friedrichs construction. It starts with the assumption that the minimal operator is bounded below and does not directly use oscillation theory.