Two responses to Atiyah-Hirz SS query..........DMD _________________________________________________ Date: Sun, 16 Jul 2000 18:59:30 -0400 (EDT) From: "Franklin P. Peterson" Subject: Re: Atiyah-Hirz SS query For Claude. The order of the differentials, at least in not too high dimesnions, are probably known. See my paper "Some Remarks on Chern Classes" in the 50's. Another possibly useful comment is that if you reduce mod 2, then d_3 = Sq^3 + Sq^2Sq^1, not Sq^3. Frank ____________________________________________________ Date: Mon, 17 Jul 2000 07:26:30 +0200 From: dominique arlettaz Subject: Re: Atiyah-Hirz SS query You can find some information on the additive order of the differentials in any AHSS in my paper "The order of the differerntials in the AHSS" published in K-Theory 6 (1992), 347-361 (you can also look at "Exponents for extraordinary homology groups", Comment. Math. Helv. 68 (1993), 653-672). Dominique Arlettaz dominique.arlettaz@ima.unil.ch