A new and simpler proof is provided of the 1993 Theorem of Csima and Sawyer which states that in an arrangement of n lines or pseudolines in the projective plane, not all passing through a common point, then as long as the arrangement is not the 7 line arrangement due to Kelly and Moser having just
3 ordinary points, the arrangement must have at least ordinary points.
By: Jonathan Lenchner
Published in: RC24181 in 2007
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