a1 Department of Mathematics and Statistics, University of Calgary, Calgary, Alberta T2N 1N4, Canada
a2 Department of Mathematics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, Canada
a3 Department of Mathematics, University of Shiraz, Iran 71454
Sturm theory is extended to the equation
for 1/p, q, rL1 [0, 1] with p, r > 0, subject to boundary conditions
Oscillation and comparison results are given, and asymptotic estimates are developed. Interlacing of eigenvalues with those of a standard Sturm–Liouville problem where the boundary conditions are ajy(j) = cj(py′)(j), j=0, 1, forms a key tool.
(Received June 26 1992)
* Research support in part by grants from the NSERC of Canada.