22 citations · 25 across the 4 of their papers we have counts for
4 papers
On a Question of Grätzer and Lakser from the 1971 {\sl Transactions of the American Mathematical Society}
Jonathan David Farley, Dominic van der Zypen
Grätzer and Lakser asked in the 1971 {\sl Transactions of the American Mathematical Society} if the pseudocomplemented distributive lattices in the amalgamation class of the subvar…
Problems 85 and 87 of Birkhoff's "Lattice theory"
Jonathan David Farley, Dominic van der Zypen
We solve problems 85 a(nd 87 from Birkhoff's book "Lattice Theory" (3rd edition)
Majority Colourings of Digraphs
Stephan Kreutzer, Sang-il Oum, Paul Seymour +2
We prove that every digraph has a vertex 4-colouring such that for each vertex , at most half the out-neighbours of receive the same colour as . We then obtain several re…
On incomplete lattice homomorphisms in subspaces of geometries: "half" a problem of Hartmanis from 1959
Jonathan David Farley, Dominic van der Zypen
Turing Award winner Juris Hartmanis introduced in 1959 lattices of subspaces of generalized partitions ("partitions of type n"; "geometries" if ). Hartmanis states it is "an…