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design

mathematics

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major reference

In combinatorics: Early developments
…beginning of the theory of design. Among the earliest books devoted exclusively to combinatorics are the German mathematician Eugen Netto’s Lehrbuch der Combinatorik (1901; “Textbook of Combinatorics”) and the British mathematician Percy Alexander MacMahon’s Combinatory Analysis (1915–16), which provide a view of combinatorial theory as it existed before 1920.
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treatment by combinatorial methods

In combinatorics: Design theory
A design is a set of T = {1, 2, . . ., υ} objects called treatments and a family of subsets B₁, B₂, . . ., B_b of T, called blocks, such that
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