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数学代写|复分析代写complex analysis代考|The differentiability of a complex function

如果你也在 怎样代写复分析complex analysis这个学科遇到相关的难题,请随时右上角联系我们的24/7代写客服。复分析complex analysis传统上称为复变函数理论,是数学分析的一个分支,研究复数函数。它对数学的许多分支都有帮助,包括代数几何、数论、分析组合学、应用数学;以及物理学。数论、分析组合学、应用数学;以及物理学,包括流体力学、热力学,特别是量子力学等分支。推而广之,复数分析在工程领域也有应用,如核、航天、机械和电气工程。

复分析complex analysis复数分析的核心工具之一是线积分。正如Cauchy积分定理所指出的那样,在封闭路径所包围的区域内到处都是全形函数,其围绕封闭路径的线积分总是为零。这样一个全形函数在圆盘内的数值可以通过圆盘边界上的路径积分来计算(如考奇积分公式所示)。复平面内的路径积分经常被用来确定复杂的实积分,这里适用于残差理论等(。一个函数的 “极点”(或孤立的奇点)是指该函数的值变得无界,或 “爆炸 “的一个点。如果一个函数有这样一个极点,那么人们可以在那里计算函数的残差,这可以用来计算涉及该函数的路径积分;这就是强大的残差定理的内容。

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数学代写|复分析代写complex analysis代考|The differentiability of a complex function

数学代写|复分析代写complex analysis代考|differentiable at the point

From the basic knowledge of mathematical analysis, it is well known that if $G \subset \mathbb{R}^{2}$ is an open set, the function
$$
f: G \rightarrow \mathbb{R}^{2}
$$
is said to be (Fréchet) differentiable at the point $\left(x_{0}, y_{0}\right) \in G$, if there exists a linear operator $A: \mathbb{R}^{2} \rightarrow \mathbb{R}^{2}$, such that
$$
\frac{\left|f(x, y)-f\left(x_{0}, y_{0}\right)-A\left(x-x_{0}, y-y_{0}\right)\right|}{\sqrt{\left(x-x_{0}\right)^{2}+\left(y-y_{0}\right)^{2}}} \rightarrow 0, \quad \text { if }(x, y) \rightarrow\left(x_{0}, y_{0}\right) .
$$
In the $\mathbb{R}^{2}$ set, with an orthogonal coordinates axis, the operator $A$ can be associ-
$$
A\left(x-x_{0}, y-y_{0}\right)=\left(a_{11}\left(x-x_{0}\right)+a_{12}\left(y-y_{0}\right), a_{21}\left(x-x_{0}\right)+a_{22}\left(y-y_{0}\right)\right) .
$$
Replacing this form of the operator $A$ in the limit formula (2.1), and denoting by $u$ and $v$ the components of the vector function $f$, it follows that
$$
\begin{aligned}
&\frac{1}{\sqrt{\left(x-x_{0}\right)^{2}+\left(y-y_{0}\right)^{2}}} |\left(u(x, y)-u\left(x_{0}, y_{0}\right), v(x, y)-v\left(x_{0}, y_{0}\right)\right) \
&-\left(a_{11}\left(x-x_{0}\right)+a_{12}\left(y-y_{0}\right), a_{21}\left(x-x_{0}\right)+a_{22}\left(y-y_{0}\right)\right) | \rightarrow 0,
\end{aligned}
$$
if $(x, y) \rightarrow\left(x_{0}, y_{0}\right)$

数学代写|复分析代写COMPLEX ANALYSIS代考|The Möbius-type groups

From here, taking $y=y_{0}$, and letting $x \rightarrow x_{0}$ we get
$$
a_{11}=\frac{\partial u\left(x_{0}, y_{0}\right)}{\partial x}, \quad a_{21}=\frac{\partial v\left(x_{0}, y_{0}\right)}{\partial x} .
$$
Similarly, taking $x=x_{0}$, and letting $y \rightarrow y_{0}$ we have
$$
a_{12}=\frac{\partial u\left(x_{0}, y_{0}\right)}{\partial y}, \quad a_{22}=\frac{\partial v\left(x_{0}, y_{0}\right)}{\partial y},
$$
hence we deduce that
$$
A=\left(\begin{array}{ll}
\frac{\partial u\left(x_{0}, y_{0}\right)}{\partial x} & \frac{\partial u\left(x_{0}, y_{0}\right)}{\partial y} \
\frac{\partial v\left(x_{0}, y_{0}\right)}{\partial x} & \frac{\partial v\left(x_{0}, y_{0}\right)}{\partial y}
\end{array}\right) .
$$
If we identify $\mathbb{R}^{2}$ with $\mathbb{C}$, then the functions $f$ and $A$ will become complex functions of the forms:
$$
\begin{aligned}
f(z)=& f(x, y)=u(x, y)+i v(x, y) ; \
f\left(z_{0}\right)=& f\left(x_{0}, y_{0}\right)=u\left(x_{0}, y_{0}\right)+i v\left(x_{0}, y_{0}\right), \quad \text { where } \
& z=x+i y, z_{0}=x_{0}+i y_{0} ; \
A\left(x-x_{0}, y-y_{0}\right)=&\left(a_{11}+i a_{21}\right)\left(x-x_{0}\right)+\left(a_{12}+i a_{22}\right)\left(y-y_{0}\right) .
\end{aligned}
$$
Letting $A_{1}=a_{11}+i a_{21}$ and $A_{2}=a_{12}+i a_{22}$, then the limit formula ( $\left.2.2\right)$ can be written as
$$
\frac{\left|f(z)-f\left(z_{0}\right)-A_{1}\left(x-x_{0}\right)-A_{2}\left(y-y_{0}\right)\right|}{\left|z-z_{0}\right|} \rightarrow 0, \quad \text { if } z \rightarrow z_{0} .
Let $G \subset \mathbb{C}$ be an open set, and let $f: G \rightarrow \mathbb{C}$. If there exist the numbers $A_{1}, A_{2} \in \mathbb{C}$ such that the limit formula (2.3) holds, then the function $f$ is said to be differentiable at the point $z_{0} \in G$.

数学代写|复分析代写complex analysis代考|The differentiability of a complex function

复分析代写

数学代写|复分析代写COMPLEX ANALYSIS代考|DIFFERENTIABLE AT THE POINT

从数学分析的基础知识可知,如果G⊂R2是开集,函数
F:G→R2
据说是éFr它是CH和吨在点可微(X0,是0)∈G, 如果存在线性算子一种:R2→R2, 这样
|F(X,是)−F(X0,是0)−一种(X−X0,是−是0)|(X−X0)2+(是−是0)2→0, 如果 (X,是)→(X0,是0).
在里面R2使用正交坐标轴设置运算符一种可以关联
一种(X−X0,是−是0)=(一种11(X−X0)+一种12(是−是0),一种21(X−X0)+一种22(是−是0)).
替换这种形式的算子一种在极限公式中2.1, 并表示为你和v向量函数的分量F, 它遵循
1(X−X0)2+(是−是0)2|(你(X,是)−你(X0,是0),v(X,是)−v(X0,是0)) −(一种11(X−X0)+一种12(是−是0),一种21(X−X0)+一种22(是−是0))|→0,
如果(X,是)→(X0,是0)

数学代写|复分析代写COMPLEX ANALYSIS代考|THE MÖBIUS-TYPE GROUPS

从这里,取是=是0, 并让X→X0我们得到
一种11=∂你(X0,是0)∂X,一种21=∂v(X0,是0)∂X.
同样,取X=X0, 并让是→是0我们有
一种12=∂你(X0,是0)∂是,一种22=∂v(X0,是0)∂是,
因此我们推断
一种=(∂你(X0,是0)∂X∂你(X0,是0)∂是 ∂v(X0,是0)∂X∂v(X0,是0)∂是).
如果我们确定R2和C, 那么函数F和一种会变成复杂函数的形式:

$$
f(z)=f(x, y)=u(x, y)+i v(x, y) \text {; }
$$
$$
\begin{aligned}
f\left(z_{0}\right)=& f\left(x_{0}, y_{0}\right)=u\left(x_{0}, y_{0}\right)+i v\left(x_{0}, y_{0}\right), \quad \text { where } \
z=x+i y, z_{0}=x_{0}+i y_{0} ;
\end{aligned}
$$
$$
A\left(x-x_{0}, y-y_{0}\right)=\left(a_{11}+i a_{21}\right)\left(x-x_{0}\right)+\left(a_{12}+i a_{22}\right)\left(y-y_{0}\right) .
$$
Letting $A_{1}=a_{11}+i a_{21}$ and $A_{2}=a_{12}+i a_{22}$, then the limit formula (2.2) can be written as
$$
\frac{\left|f(z)-f\left(z_{0}\right)-A_{1}\left(x-x_{0}\right)-A_{2}\left(y-y_{0}\right)\right|}{\left|z-z_{0}\right|} \rightarrow 0, \quad \text { if } z \rightarrow z_{0} .
$$
Definition 2.2.1. Let $G \subset \mathbb{C}$ be an open set, and let $f: G \rightarrow \mathbb{C}$. If there exist the numbers $A_{1}, A_{2} \in \mathbb{C}$ such that the limit formula (2.3) holds, then the function $f$ is said to be differentiable at the point $z_{0} \in G$.

数学代写|复分析代写complex analysis代考

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