The Ellipsoid Method
In 1979 a note of L. G. Khachiyan indicated how an algorithm, the so-called ellipsoid method, originally devised for nonlinear nondifferentiable optimization, can be modified in order to check the feasibility of a system of linear inequalities in polynomial time. This result caused great excitement in the world of mathematical programming since it implies the polynomial time solvability of linear programming problems.
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