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- Academic unit or major
- Graduate major in Mathematics
- Instructor(s)
- Naito Satoshi
- Class Format
- Lecture (Face-to-face)
- Media-enhanced courses
- Day/Period(Room No.)
- Mon5-6(M-B101(H102))
- Group
- -
- Course number
- MTH.A508
- Credits
- 1
- Academic year
- 2023
- Offered quarter
- 4Q
- Syllabus updated
- 2023/3/20
- Lecture notes updated
- -
- Language used
- English
- Access Index
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Course description and aims
The representation theory of groups investigates the different ways in which a given group acts on vector spaces.
In this lecture, we first explain the classification theory of the (finite-dimensional) irreducible representations of symmetric groups over the complex numbers, and then give an explicit realization of irreducible representations.
Also, we explain how to compute explicitly the characters of irreducible representations.
For this purpose, rather than following the classical route by Frobenius, Schur, and Young, we take an elegant, novel approach devised by Okounkov-Vershik.
This course is based on "Advanced topics in Algebra G1" in the third quarter.
Student learning outcomes
Students are expected to:
- understand the classification theory of irreducible representations of symmetric groups,
- understand how to realize explicitly irreducible representations of symmetric groups,
- understand how to compute explicitly irreducible characters of symmetric groups.
Keywords
symmetric groups, irreducible representations, irreducible characters, Murnaghan-Nakayama rule
Competencies that will be developed
| ✔ Specialist skills | Intercultural skills | Communication skills | Critical thinking skills | Practical and/or problem-solving skills |
Class flow
This is a standard lecture course. There will be some homework assignments.
Course schedule/Required learning
| Course schedule | Required learning | |
|---|---|---|
| Class 1 | Explicit realization of irreducible representations | Details will be provided during each class session |
| Class 2 | Gelfand-Zetlin basis of an irreducible representation | Details will be provided during each class session |
| Class 3 | Irreducible characters for symmetric groups | Details will be provided during each class session |
| Class 4 | Murnaghan-Nakayama rule for irreducible characters | Details will be provided during each class session |
| Class 5 | Proof of the Murnaghan-Nakayama rule: part 1 | Details will be provided during each class session |
| Class 6 | Proof of the Murnaghan-Nakayama rule: part 2 | Details will be provided during each class session |
| Class 7 | Schur's double centralizer theorem and Schur functors | Details will be provided during each class session |
| Class 8 | Schur-Weyl duality | Details will be provided during each class session |
Out-of-Class Study Time (Preparation and Review)
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.
Textbook(s)
None required.
Reference books, course materials, etc.
T. Ceccherini-Silberstein, F. Scarabotti, F. Tolli, Representation Theory of the Symmetric Groups, Cambridge University Press, 2010.
M. Lorenz, A Tour of Representation Theory, American Mathematical Society, 2018.
Assessment criteria and methods
Course scores are evaluated by homework assignments (100%). Details will be announced during the course.
Related courses
- MTH.A507 ： Advanced topics in Algebra G1
- MTH.A301 ： Algebra I
- MTH.A302 ： Algebra II
- MTH.A211 ： Advanced Linear Algebra I
- MTH.A212 ： Advanced Linear Algebra II
Prerequisites (i.e., required knowledge, skills, courses, etc.)
Advanced linear algebra and basic undergraduate algebra
Contact information (e-mail and phone) Notice : Please replace from "[at]" to "@"(half-width character).
naito[at]math.titech.ac.jp
