Graceful centers of graceful graphs and universal graceful graphs.
ResumenIn this paper we define graceful center of a graceful graph. We proved any graph G which admits α-labeling has at least four graceful centers. We also defined a new strong concept of universal graceful graph. Some results on ring sum of two graphs for their graceful labeling are proved.
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Derechos de autor 2019 Proyecciones. Revista de Matemática
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