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Journal of the Ramanujan Mathematical Society

Volume 41, Issue 3, September 2026  pp. 263–275.

The defect of weak approximation for a reductive group over a global field

Authors:  Borovoi, Mikhail and Colliot-Thélène, Jean-Louis
Author institution:Raymond and Beverly Sackler School of Mathematical Sciences, Tel Aviv University, Ramat Aviv, 6997801 Tel Aviv, Israel.

Summary:  We compute the defect of weak approximation for a reductive group G over a global field K in terms of the algebraic fundamental group of G.


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