By R. R. Bruner

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Example text

5. With Y and f as in the proposition, assume further that Y is p-local of finite type. Y + znJ~(y,f)is an equivalence J 1 (2p-3)(j+l) through dimensions less than nj + - 1. P Proof. - By the proposition, the maps H-n(q'l) o lnf) used to construct q,1 D(Y,fl induce isomorphisms in mod p homology and thus in p-local homology in 1 (2p-3)(q+l). This fact for q 2 j implies the conclusion (with degrees less than P the usual loss of a dimension as one passes from homology to homotopy). 1, we need only split D(Y,f).

As I so that coo = 0 and oiai+l = 0. i We define ExtA to be the ith right derived functor of HornA relative to injective comodules and R-split exact sequences. 2. The tensor product M@ N of right A-comodules can he made a right A-comodule by the diagonal coproduct ExtA(N,M) [The alert reader will notice that the separate maps here are well defined only if % rather than %. I When N = AR we have the right A-comodule M @ AR with diagonal coproduct, in contrast to the extended coproduct on M @ A. Nevertheless, M @ An is isomorphic to M a A as a right A-comodule.

Similarly, for the third case, it suffices to show that HxBP C A, is in the image of i,. The hypotheses of the theorems give us the following eonclusions. 1, the nontriviality of the Bockstein operation on iq, for q Proof. 3 and the fact c1 and xe2 ,. 7 and the diagram preceding the statement will suffice. X (1) If p = 2 or if p > 2 and n 3 and if xgi is in the image of i 12) If p > 2 and piis in the image of idpqX, then xri+l is in the image of = t = n n = <(a,an>x ,e > n = <*,a >, n since = 1.