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Extra Form
Lecturer Koji Fujiwara
Dept. Kyoto Univ.
date May 12, 2016

A function from a group G to integers Z is called a quasi-morphism if there is a constant C such that for all g and h in G, |f(gh)-f(g)-f(h)| < C. Surprisingly, this idea has been useful.

I will overview the theory of quasi-morphisms including applications.

Then we discuss a recent work with M.Kapovich when we replace the target group from Z to a non-commutative group, for example, a free group.


Atachment
Attachment '1'
List of Articles
Category Subject Dept. Lecturer
Math Colloquia Volume entropy of hyperbolic buildings file 서울대 임선희
Math Colloquia Contact Homology and Constructions of Contact Manifolds file 서울대 Otto van Koert
Math Colloquia 정년퇴임 기념강연: 회고 file 서울대 김도한
Math Colloquia An introduction to hyperplane arrangements file 서울대 이승진
Math Colloquia Congruences between modular forms file 서울대 유화종
Math Colloquia Geometry, algebra and computation in moduli theory file 서울대 현동훈
Math Colloquia Weyl character formula and Kac-Wakimoto conjecture file 서울대 권재훈
Math Colloquia <학부생을 위한 ε 강연> 압축센싱과 행렬완성 file 서울대 심병효
Math Colloquia Theory and applications of partial differential equations file 서울대 변순식
Math Colloquia <학부생을 위한 ε 강연> 동형암호와 근사정수론 file 서울대 천정희
Math Colloquia Periodic orbits in symplectic geometry file 서울대 강정수
Math Colloquia Mixing time of random processes file 서울대 서인석
Math Colloquia Alice and Bob meet Banach and von Neumann file 서울대 이훈희
Math Colloquia <학부생을 위한 ɛ 강연> Convergence of Fourier series and integrals in Lebesgue spaces file 서울대 이상혁
Math Colloquia Arithmetic of elliptic curves file 서울대 김도형
Math Colloquia On the distributions of partition ranks and cranks file 서울과학기술대학교 김병찬
Math Colloquia Integer partitions, q-series, and Modular forms file 서울과학기술 대학 김병찬
Math Colloquia Averaging formula for Nielsen numbers file 서강대학교 이종범
Math Colloquia Symmetry Breaking in Quasi-1D Coulomb Systems file 서강대학교 Paul Jung
Math Colloquia Noncommutative Surfaces file 서강대학교 Jens Hoppe
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