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linear complementarity problem : ウィキペディア英語版
linear complementarity problem
In mathematical optimization theory, the linear complementarity problem (LCP) arises frequently in computational mechanics and encompasses the well-known quadratic programming as a special case. It was proposed by Cottle and Dantzig
== Formulation ==
Given a real matrix M and vector q, the linear complementarity problem LCP(M,q) seeks vectors z and w which satisfy the following constraints:
* = + \,
* \ge 0, \ge 0\, (that is, each component of these two vectors is non-negative)
* \Sigma_i_i _i = 0\, (The complementarity condition). This can also be written as z^Tw = 0.
A sufficient condition for existence and uniqueness of a solution to this problem is that M be symmetric positive-definite.
If M is such that LCP(M,q) have a solution for every q, then M is a Q-matrix. If M is such that LCP(M,q) have a unique solution for every q,
then M is a P-matrix. Both of these characterizations are sufficient and necessary.
The vector \, is a slack variable,〔.〕 and so is generally discarded after \, is found. As such, the problem can also be formulated as:
* + \ge \,
* \ge \,
* ^+) = 0\, (the complementarity condition)

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