### Homotopy theory of A-infinity ring spectra and applications to MU-modules, by A. Lazarev

We give a definition of a derivation of an A-infinity ring spectrum and
relate this notion to topological Hochschild cohomology. Strict
multiplicative structure is introduced into Postnikov towers and generalized
Adams towers of A-inifinity-ring spectra. An obstruction theory for lifting
multiplicative maps is constructed. The developed techniques are then
applied to show that a broad class of complex-oriented spectra admit
structures of MU-algebras where MU is the complex cobordism spectrum. Various
computations of topological derivations and topological Hochschild cohomology
are made.

To appear in K-theory.

A. Lazarev <A.Lazarev@bristol.ac.uk>