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Apr 16, 2018 at 14:52 vote accept Tian An
Apr 5, 2018 at 12:08 answer added Mikhail Borovoi timeline score: 4
Apr 4, 2018 at 14:30 comment added Jim Humphreys The formula you quote for $\tau(G)$ seems to apply directly to a maximal torus of $G$. In any case, this kind of formula does lead to a sort of upper bound for reductive $G$: see appendix 2 by Takashi Ono (father of the number theorist Ken Ono) in the 1982 version of the 1958-59 IAS lectures by Weil: mathscinet.ams.org/mathscinet-getitem?mr=670072 (and note the very large number of MathSciNet references to later work on Tamagawa numbers, including Bourbaki Seminar lectures etc.).
Apr 4, 2018 at 11:47 history edited Tian An CC BY-SA 3.0
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Apr 4, 2018 at 11:05 history asked Tian An CC BY-SA 3.0