Some Discussions Related to Disjoint Ber's Subplanes
Some easily derivable integer sequences.
Some equidistributed statistics on Genocchi permutations.
Some equinumerous pattern-avoiding classes of permutations.
Some Erdös-Szekeres Type Results About Point in Space.
Some extensions of Chu's formulas and further combinatorial identities
We present some extensions of Chu's formulas and several striking generalizations of some well-known combinatorial identities. As applications, some new identities on binomial sums, harmonic numbers, and the generalized harmonic numbers are also derived.
Some extremal results concerning the number of graph and hypergraph colorings
Some families of increasing planar maps.
Some families of orthogonal polynomials of a discrete variable and their applications to graphs and codes.
Some families of -graphs.
Some finite congruence lattices, I
Some finite generalizations of Euler's pentagonal number theorem
Euler's pentagonal number theorem was a spectacular achievement at the time of its discovery, and is still considered to be a beautiful result in number theory and combinatorics. In this paper, we obtain three new finite generalizations of Euler's pentagonal number theorem.
Some formulas for the central trinomial and Motzkin numbers.
Some formulas that enumerate certain partitions and graphs
Some further results on Legendre numbers.
Some general classes of comatching graphs.
Some general problems on the number of parts in partitions
Some generalizations of the notions limit and colimit
Some generalized Fibonacci polynomials.
Some Generalized Quadrangles with Parameters q2, q.