PlanetMath (more info)
 Math for the people, by the people.
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05Bxx - Designs and configurations

05B05 - Block designs - 1 item
05B07 - Triple systems - 1 item
05B10 - Difference sets (number-theoretic, group-theoretic, etc.) - 1 item
05B15 - Orthogonal arrays, Latin squares, Room squares - 8 items
05B20 - Matrices (incidence, Hadamard, etc.) - 12 items
05B25 - Finite geometries - 9 items
05B30 - Other designs, configurations - 10 items
05B35 - Matroids, geometric lattices - 8 items
05B50 - Polyominoes - 1 item
05B99 - Miscellaneous - 4 items

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