組み合わせ幾何についてのこちらの文書によれば
-
- Incidence Structure
- An incidence structure is a triple
so that
are disjoint sets and
is a relation on
.
- We call elements of
points, elements of
blocks or lines and we associate each line with the set of points incident with it.
- So, if
and
satisfy p ∼ b we say that p is contained in b and write
and if
we let
- An incidence structure is a triple
- Incidence Structure