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Published online by Cambridge University Press: 20 November 2018
A configuration is a system of m points and n lines such that each point lies on μ of the lines and each line contains v of the points. It is usually denoted by the symbol (mμ,nμ) with mμ = nv. Two configurations corresponding to the same symbol are said to be equivalent if there exist 1-1 mappings of the points and lines of one onto the points and lines of the other which preserve the incidence relations.