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math.RA2022
Congruence structure of planar semimodular lattices: The General Swing Lemma
Gábor Czédli, George Grätzer, Harry Lakser
The Swing Lemma of the second author describes how a congruence spreads from a prime interval to another in a slim (having no sublattice), planar, semimodular lattice. We gen…
math.RA2022
Homomorphisms of distributive lattices as restrictions of congruences. III. Rectangular lattices and two convex sublattices
George Grätzer, Harry Lakser
Let be a finite lattice and let be an ideal of . Then the restriction map is a bounded lattice homomorphism of the congruence lattice of~ into the congruence lattice…