2 papers
math.CO2018
Mixed restricted Stirling numbers
Somaya Barati, Beáta Bényi, Abbas Jafarzadeh +1
In this note we investigate mixed partitions with extra condition on the sizes of the blocks. We give a general formula and the generating function. We consider in more details a s…
math.GR2018
Generalized power graph of groups
Abbas Jafarzadeh, Peyman Niroomand, Mohsen Parvizi
The power graph of an arbitrary group is a simple graph with all elements of as its vertices and two vertices are adjacent if one is a positive power of another. In this pa…