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arXiv 2106.08083math.OC
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一般位置及以上的基数约束最优化问题

Cardinality-constrained optimization problems in general position and beyond

Vladimir Shikhman, Sebastian Lämmel

摘要:

研究了基数约束最优化问题(CCOP)的一般情形,即. e.这些优化相关的属性,满足其定义函数的稠密和开放子集。我们发现,著名的基数约束线性独立约束规格(CC-LICQ)是通用的,在这个意义上。对于M-平稳点,我们定义了非退化性,并证明了它也是一个通有性质。特别是,稀疏性约束原来是活跃在所有的通用CCOP的最小化。此外,我们描述了全球结构的CCOP的意义上的莫尔斯理论,强调的力量的通用方法。在这里,我们证明了多个细胞需要连接,每个维度与建议的非退化M-平稳点的M-指数相一致。除了这个一般的观点,我们研究奇性CCOP。为此,我们考察了Kojima(1980)意义下的非简并性与强稳定性之间的关系。我们表明,非简并意味着后者,而相反的含义一般是不正确的。为了填补这一空白,我们利用CCOP定义函数的一阶和二阶信息充分刻画了CC-LICQ下M-平稳点的强稳定性.最后,我们将M-稳定点的非退化性和强稳定性与最近文献中引入的二阶充分条件进行了比较。

英文摘要:

We study cardinality-constrained optimization problems (CCOP) in general position, i. e. those optimization-related properties that are fulfilled for a dense and open subset of their defining functions. We show that the well-known cardinality-constrained linear independence constraint qualification (CC-LICQ) is generic in this sense. For M-stationary points we define nondegeneracy and show that it is a generic property too. In particular, the sparsity constraint turns out to be active at all minimizers of a generic CCOP. Moreover, we describe the global structure of CCOP in the sense of Morse theory, emphasizing the strength of the generic approach. Here, we prove that multiple cells need to be attached, each of dimension coinciding with the proposed M-index of nondegenerate M-stationary points. Beyond this generic viewpoint, we study singularities of CCOP. For that, the relation between nondegeneracy and strong stability in the sense of Kojima (1980) is examined. We show that nondegeneracy implies the latter, while the reverse implication is in general not true. To fill the gap, we fully characterize the strong stability of M-stationary points under CC-LICQ by first- and second-order information of CCOP defining functions. Finally, we compare nondegeneracy and strong stability of M-stationary points with second-order sufficient conditions recently introduced in the literature.

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