Some researches of projections on Hibert space
Ling Lu · Journal of Northwest University · 2009
Aim To study some important properties of projections for a Hilbert space H.Methods Using some methods of operator theory.Results If H is a separable complex Hilbert space,then ■=e(H).Conclusion It proved the sufficient and necessary conditions which the product and the addition of two projections for a Hilbert space H are projection.