Every simple rank-r matroid with no (t+1)-element independent flat has at least as many elements as the direct sum of t binary projective geometries of nearly equal ranks, with equality only for this matroid when r is at least 2t.
Tutte, Lectures on matroids, Journal of Research of the National Bureau of Standards (1965), 1—47
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The smallest matroids with no large independent flat
Every simple rank-r matroid with no (t+1)-element independent flat has at least as many elements as the direct sum of t binary projective geometries of nearly equal ranks, with equality only for this matroid when r is at least 2t.