A note on acyclic number of planar graphs

Mirko Petruševski, Riste Škrekovski


The acyclic number a(G) of a graph G is the maximum order of an induced forest in G. The purpose of this short paper is to propose a conjecture that a(G) ≥ (1 − 3/(2g))n holds for every planar graph G of girth g and order n, which captures three known conjectures on the topic. In support of this conjecture, we prove a weaker result that a(G) ≥ (1 − 3/g)n holds. In addition, we give a construction showing that the constant 3/2 from the conjecture cannot be decreased.


Induced forest, acyclic number, planar graph, girth

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DOI: https://doi.org/10.26493/1855-3974.1118.143

ISSN: 1855-3974

Issues from Vol 6, No 1 onward are partially supported by the Slovenian Research Agency from the Call for co-financing of scientific periodical publications