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math.RA2021
Retracts of rectangular distributive lattices and some related observations
Gábor Czédli
By a rectangular distributive lattice we mean the direct product of two non-singleton finite chains. We prove that the retracts (ordered by set inclusion and together with the empt…
math.RA2021
A property of meets in slim semimodular lattices and its application to retracts
Gábor Czédli
Slim semimodular lattices were introduced by G. Grätzer and E. Knapp in 2007, and they have intensively been studied since then. It is often reasonable to give these lattices by th…