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When U 0 0 1 7 n 1 7 ' = $ , . - when U, n 17 fl l7'= {P), Recall our conventions " ~ " - ~EaA,". i and in the latter case, the class of T,(U,) is determined by zo(P), the value of zo at P. Since U, itself is unique, this gives the number of extensions (U,, T,(U,)) of (U,-,, T,-, fl U,-,) counted up to infinitesimal isomorphisms. Each germ of (infinitesimal) isomorphism classes of (U,, T,(U,)) at P will be called a local class at P. A mapping P -+ I,, which assigns to each P E 17 n 17' a local class 1, at P, will be called a local condition (on (C,-,, Ck-, ; T,-,)).

G,Cv) of If we use the functor RkIs in Weil [ l l ] , p. 6, then In the following we shall regard the number field k, the 2-basis {a,, . . , o,) of o, and the form f(x) as fixed ; and we shall introduce the following "variables" : a box B in Y, of sidelength 1, a vector u = (u,, . , u,) in Rd, positive real numbers a , 9, r where /3, r 5 1, and polynomials r,(y), . . , r,(y) of degree m - 1 in y,, with coefficients in R. We say that a quantity is a parameter or a constant according as it is or is not dependent on these variables.

At any rate this implies for every i* in k , - o r , where We might also mention that Kempf's result (together with our theory of asymptotic expansions) clarifies the ambipities in [3], p. 183 and [lo], p. 129: for every @, in 9'(X,) and i* in k, we have j Fzn(i*)/ 5 const. max (1, j i* I,)-" for 1 5 i < m. Therefore if k is 'a number field. then we can apply Theorem 1 with any number between 2 and 3 as a ; hence the Poisson formula holds in this case. with a = 3 in Case 2 and a = 5 in Case 3 ; and this is so for every valuation v on k.

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