3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
本文给出了化不含平方项的两类特殊二次型为标准形的一种直接选取满秩线性变换法。
The paper teus a direct way to select nonsingular linear transformation by changing two special quadratic forms without square terms to the standard form.
引用矩阵的有关理论，给出了平方和分解式中二次型秩数的计算方法。
By introducing theories of matrix, this paper presents a calculation method for the rank of the quadratic form in quadratic sum resolution.
在假定扰动为平方可积的条件下，讨论了不确定线性系统二次指标下的最优控制问题。
The problem of robust quadratic optimal control for uncertain linear systems with Square-integral perturbation is discussed.
在假定扰动为平方可积的条件下，讨论了不确定线性系统二次指标下的最优控制问题。
The problem of robust quadratic optimal control for uncertain linear systems with Square-integral perturbation is discussed.
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