D/asymptotic//// D/bessel//// D/definite_integrals//// D/difference//// D/dirac//// D/first_order//// D/fourier_series//// D/fourier_transform//// D/gamma//// D/hilbert//// D/inhomogeneous//// D/integrals_convergence//// D/laplace//// D/self_adjoint_bvp//// D/self_adjoint_lin_op//// D/series//// D/sturm//// D/systems//// D/techniques_linear//// D/techniques_nonlinear//// D/theory_linear//// D/transformations////