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THE CLASSICAL THEORY
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abstract analogous applying Banach space Barrett boundary conditions changes sign Chapter coefficients conjoined solution conjugate points consider Corollary corresponding defined denote differential equations differential inequalities eigenfunction elliptic equations elliptic operator equation 7.2 exists formulate Green's function Green's theorem Hamiltonian system initial conditions integral interval Kreith Lemma Let u(x maximum principles nodal domain nonnegative definite nonoscillatory nonselfadjoint equations nonsingular nontrivial solution u(x obtain ordinary differential ordinary differential equations oscillation properties oscillation theory oscillatory behavior physical interpretation Picone identity 1.4 Pl(x Pn(x positive operator Priifer proof of Theorem Prufer transformation quadratic form representation respectively result Riccati equation satisfies scalar selfadjoint equations singularities solution of 7.3 solution of Lv Sturm-Picone theorem Sturmian comparison theorems Swanson symmetric matrix techniques Theorem 3.1 tion trigonometric functions u-regular valid value problems variational vector yields the following zero in a,p zeros of u(x