Note: The maximum number of minimal codewords in long codes
Discrete Applied Mathematics
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Let G be a graph on p vertices with q edges and let r = q - p = 1. We show that G has at most ${15\over 16} 2^{r}$ cycles. We also show that if G is planar, then G has at most 2r - 1 = o(2r - 1) cycles. The planar result is best possible in the sense that any prism, that is, the Cartesian product of a cycle and a path with one edge, has more than 2r - 1 cycles. © Wiley Periodicals, Inc. J. Graph Theory 57: 255–264, 2008