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math.CO2017★ 8 cited
Protection Number in Plane Trees
Clemens Heuberger, Helmut Prodinger
The protection number of a plane tree is the minimal distance of the root to a leaf; this definition carries over to an arbitrary node in a plane tree by considering the maximal su…
math.CO2001
On a functional-difference equation of Runyon, Morrison, Carlitz, and Riordan
Helmut Prodinger
A certain functional-difference equation that Runyon encountered when analyzing a queuing system was solved in a combined effort of Morrison, Carlitz, and Riordan. We simplify that…