1) Transformation of dependent variable
未知函数的变换
2) transform of an unknown function
未知函数变换
4) unknown function
未知函数
1.
By means of the conditions of total differential equation,in this paper are given the integral factor and general solution of one kind of differential equation and are obtained the differential equations that satisfy the unknown functions in some of total differential equations, thus are found the unknown functions and their general solutions.
利用全微分方程的条件 ,给出一类微分方程的积分因子及通解公式 ,得出几类全微分方程中未知函数所满足的微分方程 ,获得未知函数及全微分方程的通
2.
In this paper, using the linear substitution of unknown function, obtains a nec-essary and sufficient condition for three order linear homogeneous differential equation with variable coefficients to be three order linear differential equation with constant coefficients.
运用未知函数的线性变换,获得三阶变系数线性齐次微分方程化为三阶常系数线性微分方程的一个充要条件。
3.
The estimation of unknown function in a class of integro-sum inequalities has been proved by inductive approach and methodology of inequalities.
利用数学归纳法和不等式技巧证明一个已知的积分和不等式中未知函数的估计式成立。
5) unascertained function
未确知函数
1.
Expectation of unascertained function and its application;
未确知函数的期望及其应用
2.
Then the concept of the unascertained sequence Of number and the general unascertained function limit are given on the basis of the concept of the unascertained distance, finally the law of limit operation is established.
本文在未确知集合中定义未确知距离,由此建立未确知空间概念,在未确知距离概念基础上定义未确知数列和一般未确知函数极限概念,并且建立极限的运算法则。
3.
Conception and subtraction operations of the unascertained functions and some applied examples are given.
利用所定义的未确知函数的概念来表示某些信息 ,它推广了文〔1〕中有关概念 ,包含了连续型随机变量的表示。
6) unkn
未知的;未知数
补充资料：Radon变换和逆Radon变换
Radon变换和逆Radon变换
X线物理学术语。CT重建图像成像的主要理论依据之一。1917年澳大利亚数学家Radon首先论证了通过物体某一平面的投影重建物体该平面两维空间分布的公式。他的公式要求获得沿该平面所有可能的直线的全部投影(无限集合)。所获得的投影集称为Radon变换。由Radon变换进行重建图像的操作则称为逆Radon变换。Radon变换和逆Radon变换对CT成像的意义在于，它从数学原理上证实了通过物体某一断层层面“沿直线衰减分布的投影”重建该层面单位体积，即体素的线性衰减系数两维空间分布的可能性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条