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## MTHM028 - Algebraic Number Theory (2019)

MODULE TITLE | Algebraic Number Theory | CREDIT VALUE | 15 |
---|---|---|---|

MODULE CODE | MTHM028 | MODULE CONVENER | Prof Andreas Langer (Coordinator) |

DURATION: TERM | 1 | 2 | 3 |
---|---|---|---|

DURATION: WEEKS | 0 | 11 | 0 |

Number of Students Taking Module (anticipated) | 15 |
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Algebraic Number Theory is the study of algebraic numbers, and is a topic at the forefront of research in modern pure mathematics. The topic grew from a desire to prove Fermat’s Last Theorem, conjectured by Pierre de Fermat, in 1637, and proved by Andrew Wiles, in 1995. This module introduces and examines classes of algebraic objects, including algebraic number fields, rings of algebraic integers, and the set ideals in a ring of algebraic integers.

Towards the end of the module, you will learn about the factorisation of ideals in rings of algebraic integers. The crowning glory of this module is the examination of the ideal class group of an algebraic number field. This object measures the extent to which a ring of algebraic integers fails to be a principal ideal domain.

Pre-requisite Module: MTH3038 Galois Theory, or equivalent

The aim of this module is to expose you to an important area of modern pure mathematics, namely the theory of algebraic number fields and their rings of integers. This underlies much contemporary research in number theory and arithmetic geometry, as well as finding applications in areas such as cryptography.

On successful completion of this module, **you should be able to:**

**Module Specific Skills and Knowledge:**

1 Give definitions of the mathematical objects introduced in this module, such as algebraic numbers, algebraic number fields, algebraic integers, ideals in a ring of integers, the ideal class group;

2 Give definitions of functions, invariants, and other quantities associated with the objects mentioned in 1, such as norms and traces of algebraic numbers, rational and integral bases of algebraic number fields, discriminants of bases of number fields, norms of ideals, and the class number;

3 Perform computations related to the mathematical objects introduced in this module;

4 State and prove theorems concerning the mathematical objects introduced in this module;

**Discipline Specific Skills and Knowledge:**

5 Comprehend the role of algebraic methods in the systematic study of arithmetic problems;

6 Be proficient at learning an advanced pure mathematical topic via the traditional definition-theorem-proof style of exposition;

**Personal and Key Transferable/ Employment Skills and Knowledge:**

7 Display enhanced problem-solving skills and ability to construct and comprehend rigorous mathematical arguments.

- Algebraic Number Fields: degree, embeddings into the complex numbers; rings of integers; integral bases; discriminants;

- Ideals;

- Failure of unique factorisation into irreducibles;

- Uniqueness of factorisation into prime ideals;

- Equivalence of ideals;

- The Ideal Class Group;

- Minkowski's Theorem;

- Proof of finiteness of the class group;

- Calculation of the class group in particular cases;

- Application to Diophantine Equations.

Scheduled Learning & Teaching Activities | 33.00 | Guided Independent Study | 117.00 | Placement / Study Abroad | 0.00 |
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Category | Hours of study time | Description |

Scheduled Learning and Teaching Activities | 33 | Lectures |

Guided Independent Study | 117 | Assessment preparation; private study |

Form of Assessment | Size of Assessment (e.g. duration/length) | ILOs Assessed | Feedback Method |
---|---|---|---|

Coursework – Problem Sheets 1, 2, 3 | 1-3 pages of problems | All | Written comments on script and model solutions available |

Coursework | 0 | Written Exams | 100 | Practical Exams | 0 |
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Form of Assessment | % of Credit | Size of Assessment (e.g. duration/length) | ILOs Assessed | Feedback Method |
---|---|---|---|---|

Written Exam – Closed Book | 100 | 2 hours | All | Written/verbal on request |

Original Form of Assessment | Form of Re-assessment | ILOs Re-assessed | Time Scale for Re-reassessment |
---|---|---|---|

All Above | Written Exam (100%) | All | August Ref/Def Period |

If a module is normally assessed entirely by coursework, all referred/deferred assessments will normally be by assignment.

If a module is normally assessed by examination or examination plus coursework, referred and deferred assessment will normally be by examination. For referrals, only the examination will count, a mark of 50% being awarded if the examination is passed. For deferrals, candidates will be awarded the higher of the deferred examination mark or the deferred examination mark combined with the original coursework mark.

information that you are expected to consult. Further guidance will be provided by the Module Convener

**ELE – **http://vle.exeter.ac.uk

Reading list for this module:

Type | Author | Title | Edition | Publisher | Year | ISBN | Search |
---|---|---|---|---|---|---|---|

Set | Alaca, S. and Williams, K.S. | Introductory Algebraic Number Theory | Cambridge University Press | 2004 | 978-0521540117 | [Library] | |

Set | Frohlich, A. and Taylor, M.J. | Algebraic Number Theory | Cambridge University Press | 1991 | 978-0521366649 | [Library] | |

Set | Stewart, I. and Tall, D. | Algebraic Number Theory and Fermat's Last Theorem | 3rd | Taylor and Francis | 2002 | 978-1568811192 | [Library] |

CREDIT VALUE | 15 | ECTS VALUE | 7.5 |
---|---|---|---|

PRE-REQUISITE MODULES | MTH3038 |
---|---|

CO-REQUISITE MODULES |

NQF LEVEL (FHEQ) | 7 | AVAILABLE AS DISTANCE LEARNING | No |
---|---|---|---|

ORIGIN DATE | Tuesday 10 July 2018 | LAST REVISION DATE | Wednesday 07 August 2019 |

KEY WORDS SEARCH | Algebraic Number Theory; Fermat's Last Theorem; Rings of Algebraic Integers |
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