This quantity collects six similar articles. the 1st is the notes (written via J.S. Milne) of an incredible a part of the seminar "Periodes des Int~grales Abeliennes" given via P. Deligne at I'.B.E.S., 1978-79. the second one article was once written for this quantity (by P. Deligne and J.S. Milne) and is essentially in keeping with: N Saavedra Rivano, different types tannakiennes, Lecture Notes in Math. 265, Springer, Heidelberg 1972. The 3rd article is a mild enlargement of a part of: J.S. Milne and Kuang-yen Shih, Sh~ura forms: conjugates and the motion of complicated conjugation 154 pp. (Unpublished manuscript, October 1979). The fourth article relies on a letter from P. De1igne to R. Langlands, dated tenth April, 1979, and used to be revised and accomplished (by De1igne) in July, 1981. The 5th article is a mild revision of one other part of the manuscript of Milne and Shih noted above. The 6th article, by way of A. Ogus, dates from July, 1980.
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