The Lattice Theory Homepage

J. B. Nation's counter example to the finite height conjecture

This lattice is infinte and subdirectly irreducible but the variety it generates contains only finitely many other varieties, refuting an old conjecture. Think of this lattice as wrapped around a cylinder so that the elements at the sides with the same labels are identified. Note the middle part of this diagrams moves up when going from left to right so that when it is wrapped around the cylinder it is helical.

• A Java program indicating how the automatic lattice drawing works.
  
  
• General Algebra and Lattice Theory Homepage.
  
  
• Universal Algebra and Lattice Theory Bibliographic Database
  You can search for papers by a particular author or on a particular subject. You can choose to have the output in either BibTeX or AmSTeX format. You can even add or correct entries in the database.
  
  
• Free and Finitely Presented Lattices
  A description of the subject and a list of open problems.
  
  
• Combinatorial Problems in Lattice Theory
  Some open problems.
  
  
• Corrections to Lattices and Order
  A list of corrections to B. Davey and H. Priestley's book. This is a DVI file. You might need to choose Save Next Link As from your browser's menu. The right mouse button on unix netscape will do this.
  
  

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