semidefinite operator

例句：

1. 1. In linear algebra, a semidefinite operator is onethat can be written as a sum ofits eigenvalues.
   在线性代数中，一个半确定算子是指可以表示为其特征值之和的算子。
2. 2. The algorithm uses a semidefinite programming approach to solve the optimizationproblem.
   该算法采用半确定编程方法来解决优化问题。
3. 3. The researcher proposed a newmethod for solving semidefinite systems usingnumerical methods.
   研究者提出了一种使用数值方法解决半确定系统的新方法。