Journal:
:iranian journal of mathematical chemistry0
r. rasi azarbaijan shahid madani university, tabriz, iran s. m. sheikholeslami azarbaijan shahid madani university, tabriz, iran a. behmaram institute for research in fundamental sciences, tehran, iran
in this paper we give sharp upper bounds on the zagreb indices and characterize all trees achieving equality in these bounds. also, we give lower bound on first zagreb coindex of trees.
