Japanese Journal of Mathematics

, Volume 10, Issue 2, pp 237–248

From Pierre Deligne’s secret garden: looking back at some of his letters

Original Article

DOI: 10.1007/s11537-015-1514-9

Cite this article as:
Illusie, L. Jpn. J. Math. (2015) 10: 237. doi:10.1007/s11537-015-1514-9


I discuss four unpublished letters of Deligne (one on Hodge theory, two on Euler–Poincaré characteristics and ramification of \({\ell}\)-adic sheaves, one on generalized divisors), and sketch some of the developments they generated.

Keywords and phrases

mixed Hodge theory \({\ell}\)-adic sheaf ramification Swan conductor Euler–Poincaré characteristic characteristic cycle logarithmic structure 

Mathematics Subject Classification (2010)

32S35 14F20 11S15 14C20 

Copyright information

© The Mathematical Society of Japan and Springer Japan 2015

Authors and Affiliations

  1. 1.Département de Mathématiques, Bâtiment 425, Faculté des Sciences d’OrsayUniversité Paris Sud 11Orsay CedexFrance