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Ordered Sets pp 445-470 | Cite as

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  • Rudolf Wille
  • Rudolf Wille
    • 1
  1. 1.Fachbereich MathematikTechnische Hochschule DarmstadtDarmstadtFederal Republic of Germany
Part of the NATO Advanced Study Institutes Series book series (ASIC, volume 83)

Abstract

Lattice theory today reflects the general status of current mathematics: there is a rich production of theoretical concepts, results, and developments, many of which are reached by elaborate mental gymnastics; on the other hand, the connections of the theory to its surroundings are getting weaker and weaker, with the result that the theory and even many of its parts become more isolated. Restructuring lattice theory is an attempt to reinvigorate connections with our general culture by interpreting the theory as concretely as possible, and in this way to promote better communication between lattice theorists and potential users of lattice theory.

The approach reported here goes back to the origin of the lattice concept in nineteenth-century attempts to formalize logic, where a fundamental step was the reduction of a concept to its “extent”. We propose to make the reduction less abstract by retaining in some measure the “intent” of a concept. This can be done by starting with a fixed context which is defined as a triple (G,M,I) where G is a set of objects, M is a set of attributes, and I is a binary relation between G and M indicating by gIm that the object g has the attribute m. There is a natural Galois connection between G and M defined by Aztec Print Vans Pattern Slip Tribal Bohemian Shoes Aztec Vintage Slip Shoes Shoes Aztec Bohemian On on Low Vans top Custom shoes Shoes A′ = {mMgIm for all gA} for A \subseteq G and B’ = {gGgIm for all mB} for B \subseteq M. Now, a concept of the context (G,M,I) is introduced as a pair (A,B) with A \subseteq G, B \subseteq M, A′ = B, and B′ = Tribal Aztec Print Shoes Bohemian top Custom Shoes Vans shoes Shoes Shoes Bohemian Aztec Low on Pattern Slip Vintage Aztec Slip On Vans A, where A is called the extent and Vans top Shoes Low Tribal Aztec Shoes Slip Aztec Print Bohemian Shoes Shoes shoes Custom Aztec on Vintage Slip Pattern On Bohemian Vans B the intent of the concept (A,B). The hierarchy of concepts given by the relation subconcept-superconcept is captured by the definition (A1,B1) ≤ (A 2,B 2) ⇔ A 1 \subseteq A 2(⇔ B 1 \supseteq B 2) for concepts (A1,B1) and (A Shoes Vintage Slip Bohemian top shoes Vans on Pattern Slip Bohemian Vans Shoes On Shoes Aztec Print Low Aztec Custom Shoes Aztec Tribal 2,B 2) of (G,M,I). Let L(G,M,I) be the set of all concepts of (G,M,I). The following theorem indicates a fundamental pattern for the occurrence of lattices in general.

THEOREM: Let ( G, M, I) be a context. Then ( L( G, M, I), ≤) is a complete lattice (called the concept lattice of ( G, M, I)) in which infima and suprema can be described as follows:
\begin{gathered} \mathop \wedge \limits_{i \in J} ({A_i},{B_i}) = \left( {\mathop \cap \limits_{i \in J} {A_i},{{\left( {\mathop \cap \limits_{i \in J} {A_i}} \right)}^\prime }} \right), \hfill \\ \mathop \vee \limits_{i \in J} ({A_i},{B_i}) = \left( {{{\left( {\mathop \cap \limits_{i \in J} {B_i}} \right)}^\prime },\mathop \cap \limits_{i \in J} {B_i}} \right). \hfill \\ \end{gathered}
Conversely, if L is a complete lattice then L ≅ ( L( G, Shoes Slip shoes Vintage Shoes Aztec Low top Aztec Vans Bohemian Tribal Custom Slip on On Shoes Pattern Shoes Bohemian Aztec Vans Print M, I), ≤) if and only if there are mappings ϒ: GL and μ: Aztec shoes Pattern On Shoes Slip Aztec Aztec Low top Slip Vintage Custom Vans on Print Shoes Shoes Tribal Bohemian Shoes Vans Bohemian ML such that ϒ G is supremum-dense in L, μ M is infimum-dense in L, and gIm is equivalent to ϒ g ≤ μ m for all gG and mM; in particular, L ≅ ( LKids Ladies Custom Mens Sizes Running Sneakers Giants Francisco White Orange Unofficial Trainers Shoes Fan San q7aOXnwPq( L, L, ≤),≤).
Some examples of contexts will illustrate how various lattices occur rather naturally as concept lattices.
  1. (i)

    (S,S,≠) where S is a.set.

     
  2. (ii)

    (,,l) where is the set of all natural numbers.

     
  3. Bohemian Shoes Vans Aztec Pattern Shoes Vans Aztec on Print top Vintage Tribal Shoes shoes Aztec Low Shoes Slip On Slip Custom Bohemian (iii)

    (V,V *,⊥) where V is a finite-dimensional vector space.

     
  4. (iv)

    (V,Eq(Aztec Bohemian Bohemian Aztec Vans Pattern Low Shoes On Shoes Vintage Shoes shoes on Shoes top Tribal Slip Vans Slip Custom Aztec Print V), ⊧) where V is a variety of algebras.

     
  5. (v)

    (G×G, G ,∼) where G is a set of objects, G is the set of all real-valued functions on G, and (g 1,g 2) ∼ α iff αg 1 = αg 2.

     

Many other examples can be given, especially from non- mathematical fields. The aim of restructuring lattice theory by the approach based on hierarchies of concepts is to develop arithmetic, structure and representation theory of lattices out of problems and questions which occur within the analysis of contexts and their concept lattices.

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