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2 papers · 1 filter
math.RA2023
Large filters of quasiorder lattices can be generated by few elements
Gábor Czédli
For a poset , the quasiorders (AKA preorders) extending the poset order "" form a complete lattice , which is a filter in the lattice of all quasiorders of the s…
math.RA2023
Reducing the lengths of slim planar semimodular lattices without changing their congruence lattices
Gábor Czédli
Following G. Grätzer and E. Knapp (2007), a slim semimodular lattice, SPS lattice for short, is a finite planar semimodular lattice having no as a sublattice. An SPS lattice…