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Lattices

In: Introduction to Algebra

Author

Listed:
  • R. Kochendörffer

    (University of Dortmund)

Abstract

If A and B are subsets of a given set M then so are A ⋂ B and A ⋃ B. So the set of all subsets of M can be regarded as an algebraic system with the operations ⋂ and ⋃ If A and B are subgroups of a given group G, then A ⋂ B is again a subgroup of G. Apart from trivial cases, however, the set theoretical union of A and B is not a subgroup of G. But if A ⋃B is defined as the subgroup generated by A and B, then the set of all subgroups of G can again be considered as an algebraic system with the operations ⋂ and ⋃. The same applies to the set of all normal subgroups of G. Similarly, the subfields of a given field form an algebraic system with the operations ⋂ and ⋃ where A ⋃B means the subfield generated by the subfields A and B. Other examples of such algebraic systems arise when we consider the set of all subspaces of a given vector space or the set of all ideals of a given ring. This suggests the study of algebraic systems with two operations ⋂ and ⋃ which have some but in general not all the properties of the set theoretical intersection and union.

Suggested Citation

  • R. Kochendörffer, 1972. "Lattices," Springer Books, in: Introduction to Algebra, chapter 11, pages 379-406, Springer.
  • Handle: RePEc:spr:sprchp:978-94-009-8179-9_11
    DOI: 10.1007/978-94-009-8179-9_11
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