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Let be the number of irredundant sets of size in a graph , then the irredundance polynomial of in the variable is defined as
It may also be written as
where is the upper irredundance number of (cf. Burger et al. 1997, Mynhardt and Roux 2020).
Burger, A. P.; Cockayne, E. J.; and Mynhardt, C. M. "Domination and Irredundance in the Queens' Graph." Disc. Math. 163, 47-66, 1997.
Mynhardt, C. M. and Roux, A. "Irredundance Graphs." 14 Apr. 2020. https://arxiv.org/abs/1812.03382.
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