Ellipsoidal calculus is a method for solving problems in control and estimation theory having unknown but bounded errors in terms of sets of approximating ellipsoidal-value functions. Ellipsoidal calculus has been especially useful in the study of linear programming.
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ReferencesKurzhanski, A. B. and Vályi, I. Ellipsoidal Calculus for Estimation and Control. Boston, MA: Birkhäuser, 1996.Papadimitriou, C. H. and Steiglitz, K. Combinatorial Optimization: Algorithms and Complexity. New York: Dover, 1998.
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Weisstein, Eric W. "Ellipsoidal Calculus." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EllipsoidalCalculus.html