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linear matrix inequality : ウィキペディア英語版
linear matrix inequality
In convex optimization, a linear matrix inequality (LMI) is an expression of the form
: \operatorname(y):=A_0+y_1A_1+y_2A_2+\cdots+y_m A_m\geq0\,
where
* y=(m ) is a real vector,
* A_0, A_1, A_2,\dots,A_m are n\times n symmetric matrices \mathbb^n,
* B\geq0 is a generalized inequality meaning B is a positive semidefinite matrix belonging to the positive semidefinite cone \mathbb_+ in the subspace of symmetric matrices \mathbb.
This linear matrix inequality specifies a convex constraint on ''y''.
== Applications ==
There are efficient numerical methods to determine whether an LMI is feasible (''e.g.'', whether there exists a vector ''y'' such that LMI(''y'') ≥ 0), or to solve a convex optimization problem with LMI constraints.
Many optimization problems in control theory, system identification and signal processing can be formulated using LMIs. Also LMIs find application in Polynomial Sum-Of-Squares. The prototypical primal and dual semidefinite program is a minimization of a real linear function respectively subject to the primal and dual convex cones governing this LMI.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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