Abstract
It is well known that ( - ∞ , 0 ) and ( 0 , 1 ) are two maximal zero-free intervals for all chromatic polynomials. Jackson A zero-free interval for chromatic polynomials of graphs, Combin. Probab. Comput. 2 (1993), 325–336 discovered that ( 1 , 32 27 is another maximal zero-free interval for all chromatic polynomials. In this note, we show that ( 1 , 32 27 is actually a maximal zero-free interval for the chromatic polynomials of bipartite planar graphs.
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