# 数学代写|微积分代写Calculus代写|MATH0220

#### Doug I. Jones

Lorem ipsum dolor sit amet, cons the all tetur adiscing elit

couryes-lab™ 为您的留学生涯保驾护航 在代写微积分Calculus方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写微积分Calculus代写方面经验极为丰富，各种代写微积分Calculus相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础
couryes™为您提供可以保分的包课服务

## 数学代写|微积分代写Calculus代写|Primitives

Let $f$ be defined on $(a, b)$. A differentiable function $F$ is a primitive of $f$ if
$$F^{\prime}(x)=f(x), \quad a<x<b .$$
For example, $f(x)=x^3$ has the primitive $F(x)=x^4 / 4$ on $\mathbf{R}$ since $\left(x^4 / 4\right)^{\prime}=$ $\left(4 x^3\right) / 4=x^3$.

Not every function has a primitive on a given open interval $(a, b)$. Indeed, if $f:(a, b) \rightarrow \mathbf{R}$ has a primitive $F$ on $(a, b)$, then, by Exercise 3.2.8, $f=F^{\prime}$ satisfies the intermediate value property. Hence, $f((a, b))$ must be an interval.
Moreover, Exercise 3.1.6 shows that the presence of a jump discontinuity in $f$ at a single point in $(a, b)$ is enough to prevent the existence of a primitive $F$ on $(a, b)$. In other words, if $f$ is defined on $(a, b)$ and $f(c+), f(c-)$ exist but are not both equal to $f(c)$, for some $c \in(a, b)$, then, $f$ has no primitive on $(a, b)$.

Later (\$4.4), we see that every continuous function has a primitive on any open interval of definition. does the existence of a primitive$F$of$f$determine the continuity of$f$? To begin, it is possible (Exercise 3.6.7) for a function$f$to have a primitive and to be discontinuous at some points, so, the converse is, in general, false. However, the previous paragraph shows that such discontinuities cannot be jump discontinuities but must be wild, in the terminology of$\$2.3$. In fact, it turns out that, wherever $f$ is of bounded variation, the existence of a primitive forces the continuity of $f$ (Exercise $\mathbf{3 . 6 . 8}$ ). Thus, a function $f$ that has a primitive on $(a, b)$ and is discontinuous at a particular point $c \in(a, b)$ must have unbounded variation near $c$, i.e., must be similar to the example in Exercise 3.6.7.

From the mean value theorem, we have the following simple but fundamental fact.

## 数学代写|微积分代写Calculus代写|The Cantor Set

The subject of this chapter is the measurement of the areas of subsets of the plane $\mathbf{R}^2=\mathbf{R} \times \mathbf{R}$. The areas of elementary geometric figures, such as squares, rectangles, and triangles, are already known to us. By known to us we mean that, e.g., by defining the area of a rectangle to be the product of the lengths of its sides, we obtain quantities that agree with our intuition. Since every right-angle triangle is half a rectangle, the areas of right-angle triangles are also known to us. Similarly, we can obtain the area of a general triangle.
How does one approach the problem of measuring the area of an unfamiliar figure or subset of $\mathbf{R}^2$, say a subset that cannot be broken up into triangles? For example, how does one measure the area of the unit disk
$$D=\left{(x, y): x^2+y^2<1\right} ?$$
One solution is to arbitrarily define the area of $D$ to equal whatever one feels is right. The Egyptian book of Ahmes ( $\sim 1900$ b.c.) states that the area of $D$ is $(16 / 9)^2$. In the Indian Sulbastras (written down $\sim 500$ b.c.), the area of $D$ is taken to equal (26/15) ${ }^2$. Albrecht Dürer (1471-1528 a.d.) of Nuremburg solved a related problem which amounted to taking the arca of $D$ to cqual $25 / 8$

Which of these answers should we accept as the area of $D$ ? If we treat these answers as estimates of the area of $D$, then, in our minds, we must have the presumption that such a quantity – the area of $D$ – has a meaningful existence. In that case, we have no way of judging the merit of an estimate except by the quality of the reasoning leading to it.

Realizing this, by reasoning that remains perfectly valid today, Archimedes $(\sim 250$ b.c.) carefully established,
$$\frac{223}{71}<\operatorname{area}(D)<\frac{22}{7} .$$

# 微积分代考

## 数学代写|微积分代写Calculus代写| primitive

.

$$F^{\prime}(x)=f(x), \quad a<x<b .$$

## 有限元方法代写

tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

Days
Hours
Minutes
Seconds

# 15% OFF

## On All Tickets

Don’t hesitate and buy tickets today – All tickets are at a special price until 15.08.2021. Hope to see you there :)