• THE FIRST AND SECOND ka INDICES AND COINDICES OF GRAPHS
Abstract
The first and second Zagreb indices were introduced by Gutman and Trinajstić in 1972. Also the first and second Zagreb coindices were introduced by Došlić in 2008. In this paper, we introduce the first and second ka indices and coindices analogs of the above Zagreb indices and coindices and initiate a study of these new invariants.
Keywords
Zagreb indices, Zagreb coindices, hyper-Zagreb indices, hyper-Zagreb coindices, a indices, a coindices.
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