Web Reference: quadratic: 1.来自 Wikipedia： In mathematics, the term quadratic describes something that pertains to squares (平方/二次幂), to the operation (运算)of squaring, to terms of the second degree (次/幂), or equations or formulas that involve such terms. Quadratus is Latin for square. 2.来自iCIBA: an equation in which the highest power (幂，乘方) of an unknown quantity is a square ... 楼上从词源解释的，的确 Quadratic 词源拉丁词语 Quadratum ，它的意思是就是 Square ，为什么要这么命名这一套方程或方法 Quadratum 呢，也许是因为 2次 这个概念最开始是处理矩形面积这种几何问题，如果要计算一个 Square 的面积，那么就是 边^2 。 LQG（linear quadratic gaussian）control是什么意思呢？ 因为自动控制方面只学过一些基本的知识，可不可以尽量通俗的解释一下呢或者把一些前提的知识点列一下呢 万分感谢。
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