# 2024/25 Undergraduate Module Catalogue

## MATH3017 Calculus in the Complex Plane

### 15 creditsClass Size: 95

**Module manager:** Dr Linden Disney-Hogg; Sebastian Eterovic**Email:** A.L.Disney-Hogg@leeds.ac.uk;S.Eterovic@leeds.ac.uk

**Taught:** Semester 1 (Sep to Jan) View Timetable

**Year running** 2024/25

### Pre-requisites

MATH2017 | Real Analysis |

### This module is mutually exclusive with

MATH2016 | Analysis |

MATH2090 | Real and Complex Analysis |

**This module is not approved as a discovery module**

### Module summary

Calculus becomes immensely more powerful and, in many ways, simpler, if one allows the functions and variables under consideration to take values in the complex plane, rather than restricting them to the real line. This module will develop the theory of differentiable functions of a single complex variable, an outstanding highlight of 19th century mathematics, in a coherent and mathematically rigorous way. Towards the end, complex analytic techniques will be used to solve seemingly intractable problems inreal analysis (exact computation of integrals over the real line, and exact summation of series, for example).### Objectives

a) To develop a mathematically rigorous and coherent theory of the calculus of holomorphic functions onthe complex plane.

b) To compare and contrast this theory with the theory of real differentiable functions.

c) To apply this theory to otherwise intractable problems in real analysis.

**Learning outcomes**

On completion of this module, students should be able to:

a) use the Cauchy-Riemann equations to decide whether a given function is holomorphic;

b) construct conjugate pairs of harmonic functions;

c) compute contour integrals, from first principles, using the fundamental theorem of the calculus, Cauchy's

theorem and Cauchy's integral formula;

d) compute the Laurent series of a holomorphic function about an isolated singularity;

e) classify the singularities of holomorphic functions and to compute, in the case of a pole, its order and

residue;

f) evaluate typical definite integrals by using the calculus of residues; apply this technique to solve problems

in real analysis;

g) construct rigorous proofs of (a selection of) the theorems presented.

### Syllabus

a) Complex differentiability, the Cauchy-Riemann equations, relation to harmonic functions.

b) Contour integration, elementary methods of evaluation, the Fundamental Theorem of the Calculus, the Estimation Lemma.

c) Cauchy's Theorem (proof deferred), Cauchy's Integral Formula, applications of this (Liouville's Theorem, the Maximum Modulus Principle, the Fundamental Theorem of Algebra).

d) The Weierstrass M-test, Taylor series of holomorphic functions, holomorphic implies analytic, contrast with real analysis.

e) Laurent's Theorem, classification of singularities of holomorphic functions.

f) Cauchy's Residue Formula. Applications, including the argument principle and RouchÃ©'s theorem.

g) Applications of contour integration in real analysis.

h) Proof of Cauchy's Theorem.

### Teaching methods

Delivery type | Number | Length hours | Student hours |

Lecture | 33 | 1.00 | 33.00 |

Private study hours | 117.00 | ||

Total Contact hours | 33.00 | ||

Total hours (100hr per 10 credits) | 150.00 |

### Opportunities for Formative Feedback

6 problem sheets, self-assessed, each supported by a workshop.### Methods of assessment

**Exams**

Exam type | Exam duration | % of formal assessment |

Standard exam (closed essays, MCQs etc) | 2 hr 30 mins | 100.00 |

Total percentage (Assessment Exams) | 100.00 |

Please note: the exact length of the exam is to be determined, and is subject to change.

### Reading list

The reading list is available from the Library websiteLast updated: 22/07/2024

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- Undergraduate module catalogue
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