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Ferrers Diagram -- from Wolfram MathWorld
A Ferrers diagram represents partitions as patterns of dots, with the nth row having the same number of dots as the nth term in the partition. The spelling "Ferrars" (Skiena 1990, pp. 53 and 78) is sometimes also used, and the diagram is sometimes called a graphical representation or Ferrers...
mathworld.wolfram.com
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