Combinatorics Seminar 2014


Speaker: Yan Zhu (朱艷), Shanghai Jiao Tong University

Date: Sat, Mar 15, 2014

Time: 11:00 - 12:00

Venue: Middle Meeting Room

Title: Tight relative $2$-designs on two shells in the Johnson scheme

Abstract:

In this talk, we will discuss tight relative $2$-designs on $2$ shells in Johnson association schemes $J(v, d)$. We focus on the existence problem and determine all possible parameters of such designs for $v \leq 50$. There are some examples with constant weight.

Slides: View slides


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