Hi everyone!
I faced with a problem: prove that two vectors of inner product space is on the same ray only when $\left \| x+y \right \| = \left \| x \right \| + \left \| y \right \|$.
Does anyone know how to prove it?
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- Sun May 31, 2020 4:33 pm
- Forum: Functional Analysis
- Topic: Inner product space
- Replies: 1
- Views: 5945