How many sublattices of index N are there in the planar hexagonal lattice? Which of them are the best from the point of view of packing density, signal-to-noise ratio, or energy? We answer the first question completely and give partial answers to the other questions.
Representations of a sublattice of the partition lattice on a lattice
β Scribed by Ronny Rousseau
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 529 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
A partial ordering is defined for monotone projections on a lattice, such that the set of these mappings is a lattice which is isomorphic to a sublattice of the partition lattice.
π SIMILAR VOLUMES
## Abstract Let __E__ be a Banach lattice. Let __H__ stand for a sublattice, an ideal or a band in __E__, and denote by Ξ¦~1~(__E__) and Ξ¦~1~(__H__) the ideals of finite elements in the vector lattices __E__ and __H__, respectively. In this paper we first present some sufficient conditions and some
## Abstract We give a latticeβtheoretic characterization of the lattices of Mackey closed subspaces in a vector space __V__ (dim __V__ β§ 4): These are exactly complete finitelyβmodular ACβlattices of the length at least four which have mutually perspective atoms.
Simion, R. and D. Ullman, On the structure of the lattice of noncrossing partitions, Discrete Mathematics 98 (1991) 193-206. We show that the lattice of noncrossing (set) partitions is self-dual and that it admits a symmetric chain decomposition. The self-duality is proved via an order-reversing i