Feynman ’ s Operational Calculi : Spectral Theory for Noncommuting Self-Adjoint Operators

The spectral theorem for commuting self-adjoint operators along with the associated functional (or operational) calculus is among the most useful and beautiful results of analysis. It is well known that forming a functional calculus for noncommuting self-adjoint operators is far more problematic. The central result of this paper establishes a rich… CONTINUE READING