Let with . If prove that .

I've proven that . Now how do I show that this inquality is strict?

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- Mar 19th 2011, 07:49 AMjefferson_lcopen ball
Let with . If prove that .

I've proven that . Now how do I show that this inquality is strict? - Mar 19th 2011, 09:01 AMPlato
- Mar 19th 2011, 09:11 AMjefferson_lc
- Mar 19th 2011, 11:34 AMOpalg
You need to give us a bit more context here. What are x and y supposed to be – real numbers, complex numbers, vectors in a euclidean space, or what?

In fact, in every case the method is the same: form the square . Expand that, either as a product or in terms of inner products, depending on what sort of space you are working in, and see when that can be equal to . You should end up with an equation like (again, depending on the space). You then need to show why that can only happen when .