Unknown author (경북대학교 자연과학대학 수학과, 2026-09)
AnL(2,1)-coloring without holes is called a no-hole L(2,1)-coloring. An L(2,1)-coloring of G is said to be irreducible if none of the colors used can be decreased to yield another L(2,1)-coloring of G. An irreducible no-hole ...