Terrible video. What is an example of  a Hilbert space with real numbers in a actual application. This man is just copying lines from a text book but provides no concrete examples that would explain Hilbert. Sad. A waste of time.####[['video', 'Course_General_Feedback', 'NEG'], ['NULL', 'Instructor', 'NEG'], ['Hilbert space', 'Mathematical_Related_Concept', 'NEG'], ['real numbers', 'Mathematical_Related_Concept', 'NEG']]