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The Principle op Inclusion and Exclusion
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1-1 mapping a-width Amer arbitrary array asserts balanced incomplete block binomial coefficients called Canad column sum vector COMBINATORIAL MATHEMATICS components conjecture construction contains convex D. R. Fulkerson denote the number distinct elements labeled entries equal essential l's exists finite projective plane H. J. Ryser Hadamard matrix Hence identity matrix implies incidence matrix incomplete block designs induction hypothesis interchange Kirkman triple system l)-matrix l)-subset Latin rectangle lines main diagonal Math matric equation matrix of l's matrix of order maximal term rank minimal mod 2m multiplier n-set N(qi normalized class 21 number theory orthogonal Latin squares pair of orthogonal partition permutation matrix plane of order points positive integer prime problem Proc Proof properties quadratic residue r-permutation r-subsets Ramsey's theorem rational row and column row sum vector S. S. Shrikhande satisfy squares of order Steiner triple system subsets suppose Theorem 2.1 tion transpose X)-configuration zero