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By Leonard D. Baumert

ISBN-10: 3540053689

ISBN-13: 9783540053682

E-book by means of Baumert, Leonard D.

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24), (2~26). w of v and this is an immediate consequence Using this for w = v, v odd, yields +l = (n,V*)p = (n,V)p (n,(-l)(V-l)/2)p while k 2 = Zv + n provides +l = (n, hV)p = (n,h)p(n,V)p . Together these equations show that (n,h)p = (n,V)p = (n,(-l)(V-1)/2)p. Hence (n,Z)p (n,(-l)(V-l)/2)p = (n,(-l)(V-1)/2k)p = +l. Ioeo, the Bruck-Ryser-Chowla condition for odd v has been established as a direct consequence of Theorem 2. 7, In particular, if v,k~ Z = 241, 16, 1 the Bruck-Ryser-Chowla equation 30 z 2 = 15 x 2 Hall-Ryser However + y 2 has a solution condition 360 m -1 z = y = i, x = O.

21) has a solution in integers x, y, z, (G,~)p = +l G, ~ for all finite primes fact is written (~,~)~ = +l]. p and not all zero~ if and only if, are not both negative See Jones (1950, p. ) for this as well as the other properties of the Hilbert symbol which are needed. l)(q-l)/2 q prime such that [this last n, q of v. (q-l)/2 2 2 + (-1)" - qy = z x, y, z, is a not all zero. 26) (re,q*)p = + 1 for all primes Proof. p. Since assumed to be a prime. x,y,z = l,O,r e/2. (qlq2)* = q{ q~ If e (x,y,z = a,brJ,cr j) rx r = q ~ 3(4).

47) p Pi are conjugates. modulo g is d. 48) can be determined explicitly. irreducible equation satisfied by Further, The field automorphism determined by the fixes each of these prime ideals (P) = (P1 "'" pg)~(pa) where is given by when is the order of ~d ~ ~ in [that (p) = (i - ~d )~(d) where the distinct prime ideals where p The prime ideal decomposition of the rational prime modulo For, if w. The ideals f(x) p, ~a modulo PI' "°"Pg denotes the over the rationals then, with the f(x) ~ (fl(X) ...

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Cyclic Difference Sets by Leonard D. Baumert


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