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Journal de Th´

eorie des Nombres

de Bordeaux

18

(2006), 59–72

A system of simultaneous congruences arising

from trinomial exponential sums

par

Todd COCHRANE, Jeremy COFFELT

et

Christopher

PINNER

R´esum´e. Pourpun nombre premier etℓ < k < h < pdes entiers positifs avecd= (h, k, ℓ, p−1), nous montrons queM, le nombre de solutions simultan´eesx, y, z, wdansZ∗

p dexh+yh=zh+wh,

xk+yk=zk+wk,xℓ+yℓ=zℓ+wℓ, satisfait `a

M ≤3d2(p−1)2+ 25hkℓ(p−1).

Quand hkℓ= o(pd2), nous obtenons un comptage asymptotique

pr´ecis deM. Cela conduit `a une nouvelle borne explicite pour des sommes d’exponentielles tordues

valeur moyenne de telles sommes.

Abstract. For a prime pand positive integers ℓ < k < h < p withd= (h, k, ℓ, p−1), we show thatM, the number of

simultane-This leads to the new twisted exponential sum bound

size of such sums.

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60 ToddCochrane, JeremyCoffelt, ChristopherPinner

ToddCochrane

Department of Mathematics Kansas State University Manhattan, KS 66506, USA E-mail:[email protected]

URL:http://www.math.ksu.edu/~cochrane

JeremyCoffelt

Department of Mathematics Kansas State University Manhattan, KS 66506, USA E-mail:[email protected]

ChristopherPinner Department of Mathematics Kansas State University Manhattan, KS 66506, USA E-mail:[email protected]

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