By Tatsuo Kimura

This is often the 1st introductory publication at the concept of prehomogeneous vector areas, brought within the Nineteen Seventies by way of Mikio Sato. the writer was once an early and critical developer of the speculation and is still lively within the box. the topic combines parts of a number of parts of arithmetic, akin to algebraic geometry, Lie teams, research, quantity concept, and invariant idea. an enormous target is to create purposes to quantity concept. for instance, one of many key subject matters is that of zeta features hooked up to prehomogeneous vector areas; those are generalizations of the Riemann zeta functionality, a cornerstone of analytic quantity thought. Prehomogeneous vector areas also are of use in illustration concept, algebraic geometry and invariant conception. This e-book explains the fundamental ideas of prehomogeneous vector areas, the basic theorem, the zeta capabilities linked to prehomogeneous vector areas, and a type conception of irreducible prehomogeneous vector areas. It strives, and to a wide quantity succeeds, in making this content material, that's by way of its nature quite technical, self-contained and available. the 1st element of the publication, ""Overview of the idea and contents of this book,"" is especially noteworthy as a good advent to the topic.

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Extra info for Introduction to Prehomogeneous Vector Spaces

Sample text

2) B n-type: 5 0 2n+1 = {X e SL2n+1 ; lX X = I2n+\}> and the spinor grou p 5 pm 2n+i 5 which we will mention below, are of type B n, where n ^ 1. (3) C n-type: Spn = { X £ GL2n; *X J X = J }, where with n ^ 2. This is called the sy m p lectic group. In general, for X yA £ GLm) the condition lX A X = A is equivalent to X A ~ UX = A~l , so that we may replace the condition of Spn by the condition X J lX = J, because J “ 1 = —J. By the condition X J lX = J, we see easily that d e tX = ±1. In fact, Spn C SL2n, and moreover it is known that Spn is connected and simply connected.

J)m{x)). Note that since i,. . 5, to regular functions on Qn —S'. We assume that S ^ S'; then we have V J —S'). Indeed, suppose that V = {V) = Qn - S , since ^ o 4> is the restriction of the identity mapping 1 Qn on Qn to the identity mapping on Qn —S' , where ^ : V 2 + Qn — S is the inverse morphism of 4>• This implies S = S'; a contradiction. n - S'). [Yi,. . ,Y m\ satisfying F\v = 0 and F\(f2n-S') ^ 0. n. On the other hand, f\i2n-S' ^ 0; this is a contradiction.

T \ _ o t ! in) e n n-, = 0 (A 6 il)l= iy *. 1. Let G = {x = ( x y ) £ GLn{Q)\ f x(x) = 0 (A £ A )} b e a linear algebraic group. T h e tangent space TeG o f G at the unit element e = In is given by TeG = i = l £ 6 1 (A 6 /1 ) where we assume that { / a } a generates the ideal of Q[x i , ... ,x n] which consists of all polynomials vanishing on G. 14 1. 2. 2; x 3 - y 2 = 0} at a = (0,0) and b = ( 1 , 1 ). 2 and = {(£ , rj) G Q2\ 3£ - 2r\ — 0}. Hence we have dimTaX = 2 and dimT&X = 1 . In the case where an algebraic variety V is a Zariski open subset of an affine variety X , we denote by TaX the tangent space TaV at a G V.