Abstract
AbstractLet BG be the classifying space of an algebraic group G over the field
${\mathbb C}$
of complex numbers. There are smooth projective approximations X of
$BG\times {\mathbb P}^{\infty}$
, by Ekedahl. We compute a new stable birational invariant of X defined by the difference of two coniveau filtrations of X, by Benoist and Ottem. Hence we give many examples such that two coniveau filtrations are different.
Publisher
Cambridge University Press (CUP)
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