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- Sul-Young Choi, Puhua Guan
- Discrete Mathematics
- 1993

- Sul-Young Choi
- 2004

Introduction . In this paper we consider various additive and multiplicative problems concerning sets of integers . The major aim of our investigation is in exhibiting the relationship between the number of elements in a given set of positive integers not exceeding n and the number of integers that can always be chosen (with or without the restriction that… (More)

- Sul-Young Choi
- 1974

The main objective of this paper is to investigate the relation between the number of integers in a given subset .a of the integers 1, 2,. . ., n and the number of integers that can be chosen from 1, 2,. . ., n so that their pairwise products all appear in a. Other related problems are also considered. 1. INTRODUCTION The problems under investigation in the… (More)

- Sul-Young Choi
- Eur. J. Comb.
- 1996

- David J. Marchettea, Sul-Young Choi, Andrey Rukhin, Carey E. Priebe
- 2013

Given a labeling of the vertices and edges of a graph, we define a type of homogeneity that requires that the neighborhood of every vertex contains the same number of each of the labels. This homogeneity constraint is a generalization of regularity – all such graphs are regular. We consider a specific condition in which both the edge and vertex label sets… (More)

- Sul-Young Choi, Puhua Guan
- Discrete Mathematics
- 2007

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