零元素：集合中的一个元素，当它加上集合中的任何一个元素时，得到的数值等于被加元素值。
An element of a set that when added to any other element in the set produces a sum identical with the element to which it is added.
针对管网模型中雅克比矩阵高稀疏性的特点，采用三元组顺序表只对矩阵中的非零元素进行存储，提高了程序的存储和计算效率。
Triple table is used to only store non-zero matrix elements to improve the program's efficiency of storage and computation because simulation model's Jacobian matrix is serious sparse.
研究如何应用位移秩的方法有效地求出一个给定的结构矩阵的核空间中的一个非零元素。
The main problem considered in this paper is how to find efficiently a nonzero element in the kernel of a given structured matrix by the displacement approach.
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