Douglas N. Clark

Radial Limits and Invariant Subspaces

Patrick Ahern, Douglas N. Clark · American Journal of Mathematics · 1970 · 113 citations

Integral Geometry, Spectral Theory, Infinite Dimensional Analysis +4

On inner functions with $H^p$-derivative.

Patrick Ahern, Douglas N. Clark · The Michigan Mathematical Journal · 1974 · 99 citations · Full text

Inner Functions, Harmonic Space, Functional Analysis

On functions orthogonal to invariant subspaces

Patrick Ahern, Douglas N. Clark · Acta Mathematica · 1970 · 92 citations · Full text

Invariant subspaces in the polydisk

Om P. Agrawal, Douglas N. Clark, Ronald G. Douglas · Pacific Journal of Mathematics · 1986 · 87 citations · Full text

A note on the $p$-adic convergence of solutions of linear differential equations

Douglas N. Clark · Proceedings of the American Mathematical Society · 1966 · 39 citations · Full text

Singularly Perturbed Problem, Linear Differential Equations, -Adic Convergence +3