Geodesic
Generating functions for sequences of connected covers numbers
Prikladnaâ diskretnaâ matematika, no. 3 (2013), pp. 5-10.

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Analytical expressions are obtained for generating functions of the sequences of numbers being the amounts of connected covers of a finite set by subsets having the fixed cardinalities and properties. Recurrence relations are found for this numbers.
Keywords: cover, connected cover, finite set, subsets, combinatoric numbers, generating functions, connected graphs. 
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R. M. Ganopolsky. Generating functions for sequences of connected covers numbers. Prikladnaâ diskretnaâ matematika, no. 3 (2013), pp. 5-10. http://geodesic.mathdoc.fr/item/PDM_2013_3_a0/

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