Geometry MOC

Incidence relation

Incidence is a relation between geometric subspaces (points, lines, planes, &c.), generalizing the notion of a point being on a line, a line being in a plane, a plane containing a line, &c. In each case the subspaces are said to be incident with one another.

Incidence matrix

Given subspaces of one type and subspaces of another, the incidence relationship between these may be summarized by an incidence matrix geo

where we have invoked the Iverson bracket.

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