منابع مشابه
Enumeration of Weighted Plane Trees
In weighted trees, all edges are endowed with positive integral weight. We enumerate weighted bicolored plane trees according to their weight and number of edges. 1 Preliminaries This note is not intended for a journal publication: it does not contain difficult results, and the proofs use only standard and well-known techniques. Furthermore, some of the results are already known. However, they ...
متن کاملEnumeration of Cylindric Plane Partitions
Résumé. Cylindric plane partitions may be thought of as a natural generalization of reverse plane partitions. A generating series for the enumeration of cylindric plane partitions was recently given by Borodin. As in the reverse plane partition case, the right hand side of this identity admits a simple factorization form in terms of the “hook lengths” of the individual boxes in the underlying s...
متن کاملDeterminants in Plane Partition Enumeration
In this paper we provide a new and concise evaluation of det ij + x + i + j j 05i;j5n?1 : This determinant arose in the enumeration of certain set of plane partitions. Its previous evaluation was lengthy and complicated.
متن کاملChemical Tree Enumeration Algorithms
The need to generate graphs representing chemical structures suggested the use of computer and as a consequence the delevopment of eecient enumerating algorithms. This paper considers the isomeric acyclic structures enumeration focusin on the alkane molecular family. Two new algorithms based on Reverse Search 7] 8] are presented. The main concern of this paper is to highlight the importance of ...
متن کاملMethodology for Enumeration of Coliphages in Foodst
The effects of eluent composition, pH, and chaotropic agents on the recovery of T2, MS2, and indigenous coliphages from various foods were investigated. Additionally, methods of sample suspension and clarification were evaluated for coliphage recovery and application to various foods. Clarified sample suspensions were assayed for coliphages with a modified agar layer technique and appropriate E...
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ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 1998
ISSN: 0012-365X
DOI: 10.1016/s0012-365x(97)00122-2