By Andre Weil
This quantity includes the unique lecture notes provided by means of A. Weil during which the concept that of adeles used to be first brought, together with a number of facets of C.L. Siegel’s paintings on quadratic varieties. those notes were supplemented through a longer bibliography, and through Takashi Ono’s short survey of next study. Serving as an advent to the topic, those notes can also supply stimulation for extra learn.
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Additional info for Adeles and Algebraic Groups
1, applied to the case n = 1, shows that the set of convergence factors (Ap) which was used to define wA is a1so a set of convergence factors for Z* = Gm; we denote by z W the Tamagawa measure determi ned by thi s set on ZA = I k' and also on ZA/Zk = Ik/k*. 3, (1) is a set of convergence fac- tors for G= 0* IZ*; we denote by wG the Tamagawa measure on GA, and - 43 the corresponding measure on GA/G k. 1, and get where F is any function such that the left-hand side converges absolu- tely. n) \)=-00 in the function-field case.
V Rt· (TT1>. v (1) ) ' where (>. 3, by putting Av(i) = 1 whenever v is an infinite place of k, and otherwise : where the product is extended to all the prime divisors ki' and the norm N(P) P of p in is the absolute norm (equal to N(p)f if P is of relative degree f over pl. 1) for the torus T. On the other hand, the same argument shows that (1) is a set of convergence factors for R(l), hence for r', and also for G which is isogenous to R(l). vIe denote by d"(x,t) Tamagawa measure for rA' with the set of convergence factors the (A V)' and use similar notations for Z* and T.
Also, we have Pk depends only upon the field k. Pk for Re(s) > n s ->- n. This proves that, as is absolutely convergent - 39 - For the additive calculation, introduce on A(t) defined by A(t)=l 6+ the function for O
Adeles and Algebraic Groups by Andre Weil