Approximately Linear Functionals on Hilb
✍
Peter Šemrl
📂
Article
📅
1998
🏛
Elsevier Science
🌐
English
⚖ 147 KB
Let H be a real or complex Hilbert space, and let ) 0. A functional f on H is < Ž . Ž . Ž .< called an -approximately linear functional if f x q y y f x y f y F Ž< < 5 5 < < 5 5. x q y for all scalars , and all vectors x, y g H. If such a functional f is bounded then there exists a continuous linea