In this chapter we shall be concerned with the general theory of designs (these were defined in Section 1.1, and the definition will be repeated in 2.1). The discussion will by no means be complete: we shall concentrate mostly on results and problems significant for projective, affine, and inversive planes. These three types of designs are the subject matter of Chapters 3–6 below; only a few facts about them will be mentioned here.
KeywordsAutomorphism Group Projective Design Frobenius Group Hadamard Matrice Hadamard Matrix
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