Ohriska, Ján Positive coefficients case and oscillation. (English) Zbl 0931.34021 Discuss. Math., Differ. Incl. 18, No. 1-2, 5-17 (1998). The author deals with second-order selfadjoint differential equations of the form \[ (r(t)(y'(t))'+p(t)y(t)=0 \tag{1} \] with continuous functions \(p\), \(r\) and \(r(t)>0\) on \(I\). It is shown that the equation can be written at the same form with positive coefficients. Using his earlier result from [Czech. Math. J. 39(114), 24-44 (1989; Zbl 0673.34044)], the author establishes a sufficient condition for the oscillation of (1). Reviewer: J.Dzurina (Kosice) MSC: 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations Keywords:oscillation theory; selfadjoint equation Citations:Zbl 0673.34044 PDFBibTeX XMLCite \textit{J. Ohriska}, Discuss. Math., Differ. Incl. 18, No. 1--2, 5--17 (1998; Zbl 0931.34021)