Smooth digraphs of algebraic length 1 pp-construct all finite structures unless they have a pseudo-loop, yielding the first hardness criterion for infinite directed graph colouring.
Thus, by pickinga∈ Oin for everya′∈ O′ out as above, we eventually pick a representative of every α -class in Oin
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The sorrows of a smooth digraph: the first hardness criterion for infinite directed graph-colouring problems
Smooth digraphs of algebraic length 1 pp-construct all finite structures unless they have a pseudo-loop, yielding the first hardness criterion for infinite directed graph colouring.