Notes on Planar Semimodular Lattices

  title={Notes on Planar Semimodular Lattices},
  author={Guenter Knapp},
We show that in a finite semimodular lattice, the ordering of joinirreducible congruences is done in a special type of sublattice, we call a tight S7. 

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On congruence lattices of lattices

  • G. Grätzer, E. T. Schmidt
  • Acta Math. Acad. Sci. Hungar
  • 1962
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