, Michael Oberguggenberger, , Microlocal Hypoellipticity of Linear Partial Differential Operators with Generalized Functions as Coefficients, Transactions of the ...

Zeev Nehari, Disconjugate Linear Differential Operators, Transactions of the American Mathematical Society, Vol. 129, No. 3 (Dec., 1967), pp. 500-516 ...

Fredholm operator: A bounded linear operator characterised by a closed range, finite-dimensional kernel and cokernel, often used in solving integral and differential equations.

Introduces ordinary differential equations, systems of linear equations, matrices, determinants, vector spaces, linear transformations, and systems of linear differential equations. Prereq., APPM 1360 ...