Complexity: knots, colourings and counting
Complexity: knots, colourings and counting
Generating functions for generating trees
Discrete Mathematics
Lattice path matroids: enumerative aspects and Tutte polynomials
Journal of Combinatorial Theory Series A
Lattice path matroids: structural properties
European Journal of Combinatorics
Polynomial equations with one catalytic variable, algebraic series and map enumeration
Journal of Combinatorial Theory Series B
Note: Simple formulas for lattice paths avoiding certain periodic staircase boundaries
Journal of Combinatorial Theory Series A
The number of lattice paths below a cyclically shifting boundary
Journal of Combinatorial Theory Series A
Lattice path matroids: The excluded minors
Journal of Combinatorial Theory Series B
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We present a complete solution to the so-called tennis ball problem, which is equivalent to counting the number of lattice paths in the plane that use North and East steps and lie between certain boundaries. The solution takes the form of explicit expressions for the corresponding generating functions.Our method is based on the properties of Tutte polynomials of matroids associated to lattice paths. We also show how the same method provides a solution to a wide generalization of the problem.