Conference paper
Wavefront and caustic surfaces of refractive laser beam shaper
David L. Shealy, John A. Hoffnagle
SPIE Optical Engineering + Applications 2007
A theorem of Korovkin states that a sequence of positive linear operators on C[a, 6] converges strongly to the identity if and only if convergence holds on a three-dimensional Chebyshev subspace of C[a, b]. We extend this theorem to include Chebyshev subspaces of arbitrary dimension and convergence to other positive linear operators. © 1973, American Mathematical Society.
David L. Shealy, John A. Hoffnagle
SPIE Optical Engineering + Applications 2007
Frank R. Libsch, Takatoshi Tsujimura
Active Matrix Liquid Crystal Displays Technology and Applications 1997
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Journal of Computer and System Sciences
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