Lou M. Pretorius worked with Noam Elkies and Konrad J. Swanepoel on Sylvester-Gallai theorem analogues over complex numbers and quaternions. The original byline verifies the printed name.[ref]
They give an elementary complex-case proof and a quaternionic extension. Requiring a third configuration point on each pair's line forces containment in a low-dimensional projective flat, with different bounds over different scalar systems.[ref]

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