On the K-theory of elliptic curves
Kevin P. Knudson
Abstract
Let A be the coordinate ring of an affine elliptic curve (over an infinite field k) of the form X-p, where X is projective and p is a closed point on X. Denote by F the function field of X. We show that the image of H*(GL2(A),Z) in H*(GL2(F),Z) coincides with the image of H*(GL2(k),Z). As a consequence, we obtain numerous results about the K-theory of A and X. For example, if k is a number field, we show that r2(K2> (A) x Q)=0, where rm denotes the m-th level of the rank filtration.
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