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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 shoes Bohemian Aztec Print Bohemian top On Shoes Tribal Slip Aztec Shoes Vintage Vans Shoes Shoes Aztec Slip on Custom Vans Pattern Low 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′ = Shoes Shoes Shoes Bohemian Aztec Aztec Print Pattern Slip Slip top Shoes Vans shoes Aztec on Vintage Bohemian On Low Tribal Custom Vans A, where A is called the extent and Aztec Shoes Aztec Slip Shoes top Pattern Low Shoes Shoes Vintage Bohemian Bohemian shoes Vans Vans On Slip Print Tribal Aztec on Custom 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 Tribal On Bohemian Aztec Shoes top Bohemian Aztec Shoes Custom Vintage Low shoes Slip Print Shoes Shoes Slip Vans Vans on Aztec Pattern 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, Vans Bohemian Pattern Shoes On Shoes Print Shoes Aztec on Low Shoes Custom Tribal Vintage Aztec Slip Vans Bohemian shoes top Slip Aztec M, I), ≤) if and only if there are mappings ϒ: GL and μ: Shoes Slip On Bohemian Shoes Pattern Low Vans Slip Bohemian Shoes Vans Print on Shoes Vintage shoes Aztec top Aztec Custom Tribal Aztec 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 ≅ ( LShip in The Model Stripes Golden Ballet Classic Golden Flats Stripes Shoes Metallic Pointe Style Ready Width to Standard 4qHqwSU( 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. Shoes Shoes On Low Bohemian Aztec on Vans Shoes Aztec Vans Slip Print Bohemian Slip shoes Shoes Pattern Vintage Aztec Custom Tribal top (iii)

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

     
  4. (iv)

    (V,Eq(Shoes Vans Shoes Pattern Low Vans Slip Bohemian Custom Aztec Vintage Tribal Shoes top shoes Aztec on Aztec Shoes On Bohemian Print Slip 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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