Diagonalization of a self-adjoint operator acting on a Hilbert module. Saworotnow, Parfeny P. (1985) International Journal of Mathematics and Mathematical Sciences
Discontinuity of the product in multiplier algebras. Mohamed Oudadess (1990) Publicacions Matemàtiques Entire functions operate in complete locally A-convex algebras but not continuously. Actually squaring is not always continuous. The counterexample we give is multiplier algebra.