对称正定矩阵，顾名思义，就是对称的正定矩阵，它与正定矩阵的区别就是具有对称性，是正定矩阵中的一种特殊情况，在计算方法迭代法，直接法中常被用到。
... *三角矩阵(Triangular Matrix) *对称正定矩阵(symmetrical positive determined matrix) *非奇异方阵(Nonsingular matrix) ...
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...对称正定矩阵;广义正定矩阵;多项式矩阵。 [gap=747]Keywords The solution of AX = b; The anti-issue of AX = b; Symmetric positive matrix; Generalized positive matrix; Multinomial matrix.
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直接法中的平方根法，就是利用对称正定矩阵的三角分解而得到的求解对称正定方程组的一种有效方法。
Square root method is one of direct methods, which is an effective method for the solution of symmetrical positive liner equations through triangle decomposition of symmetrical positive matrix.
进而将积分方程形式的特征值问题转化为无穷阶正定对称矩阵的标准特征值问题。
And then the eigenvalue problem of integral equation is transformed into the standard eigenvalue problem of a positive definite matrix with infinite order.
用这个方法修正的刚度矩阵不仅满足特征方程，而且是唯一的对称半正定矩阵。
The stiffness matrix corrected by the method not only satisfies the characteristic equation, but also is the unique symmetric positive semidefinite matrix.
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