Plane Dual Statement

Some articles on dual, plane:

Duality (projective Geometry) - Principle of Duality
... For more details on this topic, see Incidence structure#Dual structure ... If one defines a projective plane axiomatically as an incidence structure, in terms of a set P of points, a set L of lines, and an incidence relation I that determines which points lie on which lines, then ... and "lines" in C=(P,L,I) to obtain the dual structure C* =(L,P,I*), where I* is the inverse relation of I ...

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    Thee for my recitative,
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