Se-jin Oh

activity

20052022

most citedKinematics of the M87 jet in the collimation zone: gradual acceleration and velocity stratification

72 citations · 873 across the 61 of their papers we have counts for

collaborators

Showing 2016 · math.COShow all

3 papers · 2 filters

math.CO2016

The number of ideals of $Z [x]$ containing $x (x - α) (x - β)$ with given index

Mitsugu Hirasaka, Semin Oh

It is well-known that a connected regular graph is strongly-regular if and only if its adjacency matrix has exactly three eigenvalues. Let $B$ denote an integral square matrix and…

math.CO2016

Association schemes all of whose symmetric fusion schemes are integral

Mitsugu Hirasaka, Kijung Kim, Semin Oh

In this paper we aim to characterize association schemes all of whose symmetric fusion schemes have only integral eigenvalues, and classify those obtained from a regular action of…

math.CO2016

Catalan triangle numbers and binomial coefficients

Kyu-Hwan Lee, Se-jin Oh

The binomial coefficients and Catalan triangle numbers appear as weight multiplicities of the finite-dimensional simple Lie algebras and affine Kac--Moody algebras. We prove that a…

The number of ideals of Z[x] containing x(x−α)(x−β) with given index

Association schemes all of whose symmetric fusion schemes are integral

Catalan triangle numbers and binomial coefficients

The number of ideals of $Z [x]$ containing $x (x - α) (x - β)$ with given index