Michael E. Henderson
International Journal of Bifurcation and Chaos in Applied Sciences and Engineering
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.
Michael E. Henderson
International Journal of Bifurcation and Chaos in Applied Sciences and Engineering
Ligang Lu, Jack L. Kouloheris
IS&T/SPIE Electronic Imaging 2002
F. Odeh, I. Tadjbakhsh
Archive for Rational Mechanics and Analysis
Nimrod Megiddo
Journal of Symbolic Computation