▾ Set of symbols
▾ Alphabet
▾ Deduction system
▾ Theory
▾ Zermelo-Fraenkel set theory
▾ Set
▾ Binary cartesian set product
▾ Binary relation
▾ Binary endorelation
▾ Digraph
Confounder digraph
Formulation 0
A D2696: Digraph $G = (X, \mathcal{E})$ is a confounder digraph if and only if
(1) $X = \{ x, y, z \}$
(2) $\mathcal{E} = \{ (z, x), (z, y) \}$