• 论文 •

### 求线性比式和问题全局解的输出空间分枝定界算法

1. 1. 宁夏大学数学统计学院, 银川 750021;
2. 北方民族大学数学与信息科学学院, 银川 750021;
3. 宁夏智能信息与大数据处理重点实验室, 银川 750021
• 收稿日期:2021-04-27 出版日期:2022-05-14 发布日期:2022-05-06
• 通讯作者: 高岳林,Email:gaoyuelin@263.net.
• 基金资助:
国家自然科学基金项目(11961001),宁夏高等教育一流学科建设资助项目(NXYLXK2017B09),北方民族大学重大专项(ZDZX201901)资助.

Zhang Bo, Gao YueLin. AN OUTPUT-SPACE BRANCH-AND-BOUND ALGORITHM FOR FINDING THE GLOBAL SOLUTION OF THE SUM-OF-LINEAR-RATIOS PROBLEM[J]. Mathematica Numerica Sinica, 2022, 44(2): 233-256.

### AN OUTPUT-SPACE BRANCH-AND-BOUND ALGORITHM FOR FINDING THE GLOBAL SOLUTION OF THE SUM-OF-LINEAR-RATIOS PROBLEM

Zhang Bo1, Gao YueLin2,3

1. 1. School of Mathematics and Statistics, Ningxia University, Yinchuan 750021, China;
2. School of mathematics and information science, North Minzu University, Ningxia, Yinchuan 750021, China;
3. Ningxia province key laboratory of intelligent information and data processing, Ningxia, Yinchuan 750021, China
• Received:2021-04-27 Online:2022-05-14 Published:2022-05-06

Based on the idea of subdividing p - 1-dimensional output space, a branch-and-bound algorithm for solving the sum-of-linear-ratios problem is proposed. An equivalent problem of the original problem is obtained by a two-stage transformation method, which makes the non-convexity mainly reflected in the newly added p-1 nonlinear equality constraints in the equivalent problem. These nonlinear constraints are convexized by using the concave and convex envelope of bilinear functions, and the convex relaxation subproblem is constructed for the equivalent problem. By removing the redundant constraints of the convex relaxation subproblem and making equivalent transformation, a linear programming problem with smaller scale and fewer constraints than the convex relaxation subproblem is obtained. The theoretical convergence and computational complexity of the algorithm are proved. Numerical experiments illustrate the validity and feasibility of the algorithm.

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