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Xn+1 ] ∂Xn+1 = ker = ‫[ރ‬X1 , . . , Xn ]. Société Mathématique de France 64 Arno van den ESSEN Combining this with (10) we get ‫[ރ‬F1 , . . , Fn ] = ‫[ރ‬X1 , . . , Xn ]. So to study the Jacobian Conjecture we can as well study the Kernel Conjecture. Also we may assume that n ≥ 2, since KC(1) is obvious. 6 — Let n ≥ 2 and D be any non-zero derivation on k[X1 , . . , Xn ], where k is a field with char(k) = 0. Does it follow that k[X]D := ker(D, k[X]) is a polynomial ring in n − 1 variables?

53] S. König, A. Zimmermann, Tilting hereditary orders, to appear in Comm. in Alg. [54] H. Lenzing, Nilpotente Elemente in Ringen von endlicher globaler Dimension, Math. Z. 108 (1969), 313–324. [55] M. Linckelmann, Derived equivalences for cyclic blocks over a p-adic ring, Math. Z. 207 (1991), 293–304. -L. Loday, Cyclic Homology, Grundlehren 301, Springer-Verlag, 1992. -L. Loday, D. Quillen, Cyclic homology and the Lie algebra homology of matrices, Comment. Math. Helv. 59 (1984), 565–591. [58] N.

As a result many false proofs have been given and even several of them are published (for an account on these ‘proofs’ we refer to the paper [4]). But more importantly the study of the Jacobian Conjecture has given rise to several surprising results concerning polynomial automorphisms and many interesting relations with other problems. In the remainder of this section we will describe the present status of the ndimensional Jacobian Conjecture. So from now on let F = (F1 , . . , Fn ) : ‫ރ‬n → ‫ރ‬n be a polynomial map.

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Calendrier 2011 (Ciel et Espace) by Association française d'astronomie


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