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Wavefront and caustic surfaces of refractive laser beam shaper
David L. Shealy, John A. Hoffnagle
SPIE Optical Engineering + Applications 2007
Paper
Extending semilattices is hard
Abstract
We show that the semilattice extension problem raised by Arbib and Manes in [2] is NP-hard, implying that no simple solution is likely to be forthcoming. © 1983 Birkhäuser Verlag.
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