Results 121 to 130 of about 208 (162)

A combinatorial proof of a result for permutation pairs

open access: yesOpen Mathematics, 2012
Mansour Toufik, Shattuck Mark
doaj   +1 more source

Ordered Construction Of Combinatorial Objects

open access: yes, 2007
. The generating function method for counting species of combinatorial objects is applied to the construction of the objects in order. The species considered are those described using context-free grammars with additional group-invariant operators.
Mitch Harris, Nachum Dershowitz
core  

Secant tree calculus

open access: yesOpen Mathematics, 2014
Foata Dominique, Han Guo-Niu
doaj   +1 more source

and

open access: yes, 2010
. A centrosymmetric permutation is one which is invariant under the reversecomplement operation, or equivalently one whose associated standard Young tableaux under the Robinson-Schensted algorithm are both invariant under the Schützenberger involution ...
Matteo Silimbani, Mark F. Flanagan
core  

Parity-alternating permutations and successions

open access: yesOpen Mathematics, 2014
Munagi Augustine
doaj   +1 more source

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