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An incidence structure C = {\displaystyle C=} consists of points P {\displaystyle P} , lines L {\displaystyle L} , and flags I ⊆ P × L {\displaystyle I\subseteq P\times L} where a point p {\displaystyle p} is said to be incident with a line l {\displaystyle l} if ∈ I {\displaystyle \in I}. It is a partial geometry if there are integers s , t , α ≥ 1 {\displaystyle s,t,\alpha \geq 1} such that:
A partial geometry with these parameters is denoted by p g {\displaystyle pg}.
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