Complex Variables

Complex numbers, variables, functions and series in the complex plane.

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This course is also part of the following learning track. You may join the track to gain comprehensive knowledge across related courses.
CHE 305: Engineering Analysis I
CHE 305: Engineering Analysis I
Advanced engineering mathematics covering solid analytical geometry, integrals, scalar and vector fields, matrices and determinants and complex variables. Curated for third-year students of engineering at Obafemi Awolowo University, Ile-Ife, Nigeria. Students and professionals with similar learning goal will also find this learning track useful.

Advanced engineering mathematics covering solid analytical geometry, integrals, scalar and vector fields, matrices and determinants and complex variables. Curated for third-year students of engineering at Obafemi Awolowo University, Ile-Ife, Nigeria. Students and professionals with similar learning goal will also find this learning track useful.

Course Chapters

1
Introduction

A review of complex numbers and the complex plane.

Chapter lessons

1.Complex numbers18:25

Meaning of complex numbers and their use.

2.Properties of complex numbers22:43

Some important properties of complex numbers.

3.Absolute values13:11

Absolute values of complex numbers.

4.Polar form8:06

Polar form of complex numbers.

5.Arguments43:09

General arguments and principal argument of a complex number.

6.Euler's formula13:11

The Euler formula and exponential form of complex numbers.

7.Computer-aided handling23:12

Computer-aided handling of complex numbers using Microsoft Excel.

2
Point Sets in the Complex Plane

Various terminologies for describing sets of points in the complex plane, and their meanings.

Chapter lessons

1.Disks10:23

Open and closed disks.

2.Neighborhoods4:57

General neighborhoods and deleted neighborhoods.

3.Points

Interior, boundary, exterior, limit and isolated points.

4.Point sets

Open and closed point sets.

5.Half-planes

Open and closed half-planes.

6.Paths

Continuous, smooth, piecewise-smooth, simple, closed, and simple closed curves, contour, polygonal path or line.

7.Structure of point sets

Connected, convex, star-like or star-shaped sets.

8.Domains and regions

Simply-connected and multiply-connected domains, open and closed regions.

3
Functions of Complex Variables

Introduction to functions of complex variables.

Chapter lessons

1.Definition

Meaning of function of a complex variable.

2.Domain of definition

Domain of definition of a function of a complex variable.

3.Worked examples I

Worked examples on the domain of definition of functions of complex variables.

4.Graphing

Graphing functions of complex variables.

4
Limits

Limits of functions of complex variables.

Chapter lessons

1.Informal definition

Informal definition of the limits of complex functions, and the conditions for their existence.

2.Formal definition

Formal definition of the limits of complex functions, and the conditions for their existence.

3.Worked examples I

Worked examples on the proof of the existence of limits of complex functions.

4.Evaluation

Evaluating limits of complex functions.

5.Worked examples II

Worked examples on the evaluation of limits of complex functions.

6.Worked examples III

More worked examples on the evaluation of limits of complex functions.

7.Worked examples IV

More worked examples on the evaluation of limits of complex functions.

5
Continuity

Continuity of functions of complex variables.

Chapter lessons

1.Informal definition

Informal definition of the continuity of complex functions.

2.Formal definition

Formal definition of the continuity of complex functions.

3.Worked examples I

Worked examples on the continuity of complex functions.

4.Worked examples II

More worked examples on the continuity of complex functions.

5.Worked examples III

More worked examples on the continuity of complex functions.

6.Worked examples IV

More worked examples on the continuity of complex functions.

6
Differentiability

Differentiability of functions of complex variables.

Chapter lessons

1.Definition

Definition of differentiability of complex functions.

2.Worked examples I

Worked examples on the differentiability of complex functions.

3.Worked examples II

More worked examples on the differentiability of complex functions.

7
Cauchy-Riemann Equations

Necessary and sufficient conditions for the existence of the derivatives of complex functions.

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