He covers conventions, the spectral sequence of a bisimplical coalgebra, bialgebra actions on the cohomology of algebras, extensions of Hopf algebras, Steenrod operations
in the change-of-rings spectral sequence, the Eilenberg-Moore spectral sequence, and Steenrod operations
in the Eilenberg-Moore spectral sequence.
To state known results related to this composite, we need different types of Steenrod operations which we now review.
Then one of the definitions of the Steenrod operations on a topological space X, the one given as the cup-r products, begins with a map of augmented chain complexes of Z/2[C.sub.2]-modules