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called flags. if ( p , l ) ∈ i , {\displaystyle (p,l)\in i,} we say that point p "lies on" line l {\displaystyle l} . topics in this area include: configurations line arrangements hyperplane arrangements buildings oriented matroids[ edit ] main article: oriented matroid an oriented matroid is a mathematical
of hungarian mathematics in the twentieth century, i, new york: springer, pp. – , isbn ^ rockafellar . björner et alia, chapters - . bokowski, chapter . ziegler, chapter . ^ björner et alia, chapters - . bokowski, chapters - . ^ because matroids and oriented matroids are abstractions of other mathematical...
https://en.wikipedia.org/wiki/Discrete_geometry