Abstract
A conic optimization problem (COP) is the problem of minimizing a given linear objective function over the intersection of an affine space and a closed convex cone. Conic optimization problem is often used for solving nonconvex optimization problems. The strict feasibility of COP is important from the viewpoint of computation. The lack of the strict feasibility may cause the instability of computation. This article provides a brief introduction of COP and a characterization of the strict feasibility of COP. We also explain a facial reduction algorithm (FRA), which is based on the characterization. This algorithm can generate a strictly feasible COP which is equivalent to the original COP, or detect the infeasibility of COP.
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Notes
- 1.
We remark that the formulation (3) of SDP in this article is different from one in the article of Dr. Fujisawa. However, one can obtain the form in the article of Dr. Fujisawa by applying the following replacement:
$$ \begin{array}{cc} b \rightarrow -c,&L_i \rightarrow -F_i. \end{array} $$Then, (3) can be reformulated as a minimization problem on \(y\).
- 2.
For a given convex set \(C\subset \mathbb {R}^n\), a face of \(C\) is a convex subset \(D\) of \(C\) such that every \(x, y\in C\), \(x+y\in D\) implies that \(x, y\in D\). If \(C\) is polyhedral, then the definition is simpler. In fact, a face of polyhedral set \(C\) is the intersection with a hyperplane and \(C\). Such a face is called exposed face. See [10, 14] for more details.
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Acknowledgments
The author was supported by a Grant-in-Aid for JSPS Fellow 20003236 and a Grant-in-Aid for Young Scientists (B) 22740056.
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Waki, H. (2014). Strict Feasibility of Conic Optimization Problems. In: Nishii, R., et al. A Mathematical Approach to Research Problems of Science and Technology. Mathematics for Industry, vol 5. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55060-0_24
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