An Appeal to the Delegates to the National Convention of the YCL

Typed letter in support of the Young Peoples Scoialist League. Additional signees: Milton Zaslow, Abe Weber, Max Mont, Bernard Lieberman, Irving Feigin, Helen Gourin, Maritian Malraux Student Publications: The Campus Newspaper Collectio

The index of projective families of elliptic operators

An index theory for projective families of elliptic pseudodifferential operators is developed. The topological and the analytic index of such a family both take values in twisted K-theory of the parametrizing space, X. The main result is the equality of these two notions of index when the twisting class is in the torsion subgroup of H^3(X;Z). The Chern character of the index class is then computed.Comment: Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol9/paper11.abs.htm