Proof of Cauchy Schwarz for complex numbers

In summary, to solve the equation <x - ty, x - ty> where t = <x,y>/<y,y>, you can simplify it by working out <x,ty> and making the substitution t = <x,y>/<y,y>.
  • #1
dispiriton
8
0

Homework Statement


I am told to try and solve <x - ty, x - ty> where t = <x,y>/<y,y>
However, I am stuck at that equation and unable to manipulate it to get rid of the *

Homework Equations





The Attempt at a Solution


<x - ty, x - ty> = <x,x> - <x,ty> - <ty,x> + <ty,ty>
= mod(x)^2 + mod(y)^2 (t^2) - t*<x,y> - (<x,ty>)*
 
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  • #2
dispiriton said:

Homework Statement


I am told to try and solve <x - ty, x - ty> where t = <x,y>/<y,y>
However, I am stuck at that equation and unable to manipulate it to get rid of the *

Greetings dispiriton! What do you mean by "the *"?
 
  • #3
dispiriton said:
<x - ty, x - ty> = <x,x> - <x,ty> - <ty,x> + <ty,ty>
= mod(x)^2 + mod(y)^2 (t^2) - t*<x,y> - (<x,ty>)*

You could simmplify this further by working out <x,ty>*. Try to get thet out of the inproduct.

Then, make the substitution t=<x,y>/<y,y>...
 
  • #4
Undoubtedly0 said:
Greetings dispiriton! What do you mean by "the *"?

Its sort of like the "bar" where it is the conjugate.
 

Related to Proof of Cauchy Schwarz for complex numbers

1. What is the Cauchy Schwarz inequality for complex numbers?

The Cauchy Schwarz inequality for complex numbers states that for any two complex number sequences, the inner product of the sequences is less than or equal to the product of the norms of the sequences.

2. How is the Cauchy Schwarz inequality proven for complex numbers?

The proof of the Cauchy Schwarz inequality for complex numbers involves using the properties of inner products and the Cauchy Schwarz inequality for real numbers. The complex numbers are treated as vectors in a real vector space, and the proof follows a similar logic as the proof for real numbers.

3. Can the Cauchy Schwarz inequality be extended to higher dimensions?

Yes, the Cauchy Schwarz inequality can be extended to higher dimensions, including infinite dimensions. This is known as the generalized Cauchy Schwarz inequality.

4. What are some applications of the Cauchy Schwarz inequality for complex numbers?

The Cauchy Schwarz inequality has many applications in mathematics and physics, including in the study of Fourier series, differential equations, and quantum mechanics. It is also used in optimization problems and in proving other important mathematical theorems.

5. Is the Cauchy Schwarz inequality only applicable to complex numbers?

No, the Cauchy Schwarz inequality is applicable to a wide range of mathematical objects, including real numbers, vectors, matrices, and functions. It is a fundamental inequality in mathematics with many applications in different fields.

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