Geodesic
Variational method and conjugacy criteria for half-linear differential equations
Archivum mathematicum, Tome 49 (2013) no. 1, pp. 9-16.

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We establish new conjugacy criteria for half-linear second order differential equations. These criteria are based on the relationship between conjugacy of the investigated equation and nonpositivity of the associated energy functional.
DOI : 10.5817/AM2013-1-9
Classification : 34A34, 34C10
Keywords: half-linear differential equation; conjugacy criteria; variational principle; energy functional; half-linear trigonometric functions 
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Chvátal, Martin; Došlý, Ondřej. Variational method and conjugacy criteria for half-linear differential equations. Archivum mathematicum, Tome 49 (2013) no. 1, pp. 9-16. doi : 10.5817/AM2013-1-9. http://geodesic.mathdoc.fr/articles/10.5817/AM2013-1-9/

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