-enumeration of self-complementary plane partitions.
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-primary ideals of a commutative ring
Gülşen Ulucak, Ece Yetkin Çelikel (2020)
Czechoslovak Mathematical Journal
Let be a commutative ring with nonzero identity, let be the set of all ideals of and an expansion of ideals of defined by . We introduce the concept of -primary ideals in commutative rings. A proper ideal of is called a -primary ideal if whenever and , then or . Our purpose is to extend the concept of -ideals to -primary ideals of commutative rings. Then we investigate the basic properties of -primary ideals and also discuss the relations among -primary, -primary and...
2-enumerations of halved alternating sign matrices.
Eisenkölbl, Theresia (2001)
Séminaire Lotharingien de Combinatoire [electronic only]
321-polygon-avoiding permutations and Chebyshev polynomials.
Mansour, Toufik, Stankova, Zvezdelina (2003)
The Electronic Journal of Combinatorics [electronic only]
A bijection between 3-Motzkin paths and Schröder paths with no peak at odd.
Shapiro, Louis W., Wang, Carol J. (2009)
Journal of Integer Sequences [electronic only]
A bijection between planar constellations and some colored Lagrangian trees.
Chauve, Cedric (2003)
Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only]
A bijection on Dyck paths and its cycle structure.
Callan, David (2007)
The Electronic Journal of Combinatorics [electronic only]
A bijective proof of the hook-content formula for super Schur functions and a modified jeu de taquin.
Krattenthaler, C. (1996)
The Electronic Journal of Combinatorics [electronic only]
A Catalan transform and related transformations on integer sequences.
Barry, Paul (2005)
Journal of Integer Sequences [electronic only]
A census of vertices by generations in regular tessellations of the plane.
Paul, Alice, Pippenger, Nicholas (2011)
The Electronic Journal of Combinatorics [electronic only]
A chaotic cousin of Conway's recursive sequence.
Pinn, Klaus (2000)
Experimental Mathematics
A Characterization of Multidimensional -Automatic Sequences
Emilie Charlier, Tomi Kärki, Michel Rigo (2009)
Actes des rencontres du CIRM
An infinite word is -automatic if, for all , its st letter is the output of a deterministic automaton fed with the representation of in the considered numeration system . In this extended abstract, we consider an analogous definition in a multidimensional setting and present the connection to the shape-symmetric infinite words introduced by Arnaud Maes. More precisely, for , we state that a multidimensional infinite word over a finite alphabet is -automatic for some abstract numeration...
A closed formula for the number of convex permutominoes.
Disanto, Filippo, Frosini, Andrea, Pinzani, Renzo, Rinaldi, Simone (2007)
The Electronic Journal of Combinatorics [electronic only]
A closer look at lattice points in rational simplices.
Beck, Matthias (1999)
The Electronic Journal of Combinatorics [electronic only]
A colorful involution for the generating function for signed Stirling numbers of the first kind.
Levande, Paul (2010)
The Electronic Journal of Combinatorics [electronic only]
A combinatorial derivation of the number of labeled forests.
Callan, David (2003)
Journal of Integer Sequences [electronic only]
A combinatorial derivation with Schröder paths of a determinant representation of Laurent biorthogonal polynomials.
Kamioka, Shuhei (2008)
The Electronic Journal of Combinatorics [electronic only]
A combinatorial interpretation for a super-Catalan recurrence.
Callan, David (2005)
Journal of Integer Sequences [electronic only]
A combinatorial interpretation for an identity of Barrucand.
Callan, David (2008)
Journal of Integer Sequences [electronic only]
A combinatorial interpretation for certain relatives of the Conolly sequence.
Balamohan, B., Li, Zhiqiang, Tanny, Stephen (2008)
Journal of Integer Sequences [electronic only]
Currently displaying 1 – 20 of 853
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