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Results tagged with co.combinatorics
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user 15021
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
0
votes
1
answer
256
views
ask for a simple bijective proof about oriented increasing binary trees
Give a bijective proof-----the number of oriented increasing binary trees on the vertex set
$\lbrace 1,2,\cdots,n\rbrace$ is the Eulerian number $E_n$(the number of alternating permutations in
$\math …
- 153
4
votes
1
answer
547
views
a simple combinatorial problems
what sequence $C=(c_1,\cdots,c_n)\in \mathbb{N}^n$ with $\sum ic_i=n$ maximizes the number of
$\omega\in\mathfrak{S}_n$ of type $C$? For instance,when $n=4$ the maximizing sequence is
$(1,0,1,0)$.
- 109k