issue Special Issue Dedicated to Prof. George A. Grätzer publication date 2019-07-01

• The function ring functors of pointfree topology revisited
• On semi weak factorization structures
• A convex combinatorial property of compact sets in the plane and its roots in lattice theory
• The categories of lattice-valued maps, equalities, free objects, and $mathcal C$-reticulation
• Another proof of Banaschewski's surjection theorem
• Intersection graphs associated with semigroup acts
• Completeness results for metrized rings and lattices
• (r,t)-injectivity in the category $S$-Act
• Frankl's Conjecture for a subclass of semimodular lattices