Proof Let {u1, u2, . . . , um} be an orthonormal subsetof
Chapter 5, Problem 5.55(choose chapter or problem)
Proof Let {u1, u2, . . . , um} be an orthonormal subsetof Rn, and let v be any vector in Rn. Prove that!v!2 mi=1(v ui)2.(This inequality is called Bessels Inequality.)
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer