Abstract
The Mycielski’s construction is a well-known construction on graphs which transforms a [Formula: see text]-chromatic triangle-free graph [Formula: see text] into a [Formula: see text]-chromatic triangle-free graph [Formula: see text] which is called the Mycielski graph of [Formula: see text]. In this paper, we compute the Harary index, additively weighted Harary index, and multiplicatively weighted Harary index of the Mycielski graph of any simple connected graph with girth greater than [Formula: see text].
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