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 Characterization of finite colored spaces with certain conditions J. Korean Math. Soc.Published online 2019 Apr 05 Mitsugu Hirasaka, and Masashi Shinohara Pusan National University, Shiga University Abstract : A \textit{colored space} is the pair $(X,r)$ of a set $X$ and a function $r$ whose domain is $X\choose 2$. Let $(X,r)$ be a finite colored space and $Y,Z\subseteq X$. We shall write $Y\simeq_r Z$ if there exists a bijection $f:Y\to Z$ such that $r(U)=r(f(U))$ for each $U\in {Y\choose 2}$. We denote the numbers of equivalence classes with respect to $\simeq_r$ contained in $X \choose 2$ and $X\choose 3$ by $a_2(r)$ and $a_3(r)$, respectively. In this paper we prove that $a_2(r)\leq a_3(r)$ when $5\leq |X|$, and show what happens when the equality holds. Keywords : colored spaces, isometric sequences, distance sets MSC numbers : 05C15, 05C35 Full-Text :