""Contents""; ""Abstract""; ""Introduction""; ""Chapter 1, Algebraic Information""; ""Introduction""; ""1.1 Recollections and Notations""; ""1.2 A Theorem of Massey, Peterson and Barcus""; ""1.3 Methods for Calculating Ext[sup(s)](M,N)""; ""1.4 Facts Concerning the Cohomology of the Steenrod Algebra""; ""Chapter 2, Adams Resolutions and Obstruction Theory""; ""Introduction""; ""2.1 Realization Theory""; ""2.2 Homological Criterion for Lifting Maps""; ""2.3 Power Spaces""; ""2.4 A Homological Criterion for H�Structures""; ""Chapter 3, Proof of Theorem B""; ""3.1 Outline of the Argument"" |