Abstract
We prove, using the main result of a previous Note by the author, that the Eisenstein classes (defined there in Section 4) of Hilbert–Blumenthal families degenerate, at the ∞ cusp of the Baily–Borel compactification of the base, to a special value of an L-function of the underlying totally real number field. As a corollary we get both an alternative proof of the Klingen–Siegel theorem and a non-vanishing result for some of these classes. To cite this article: D. Blottière, C. R. Acad. Sci. Paris, Ser. I 345 (2007).
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