Sigma matrices question Group theory

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SUMMARY

Every 2x2 Hermitian matrix must satisfy specific properties due to its structure, which includes real diagonal elements and complex conjugate off-diagonal elements. The discussion centers around understanding why these matrices adhere to a particular equation, as outlined in the referenced textbook. The participants agree that while the reasoning may seem obvious to some, it is not universally clear, indicating a need for further exploration of the underlying principles.

PREREQUISITES
  • Understanding of Hermitian matrices
  • Familiarity with complex conjugates
  • Basic knowledge of linear algebra
  • Ability to interpret mathematical expressions
NEXT STEPS
  • Study the properties of Hermitian matrices in detail
  • Learn about the implications of complex conjugates in matrix theory
  • Explore linear algebra textbooks for examples of 2x2 matrices
  • Investigate the derivation of equations related to Hermitian matrices
USEFUL FOR

Students of linear algebra, mathematicians, and anyone interested in the properties of Hermitian matrices and their applications in group theory.

helpcometk
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Homework Statement


I have read the following text in a textbook(look the attaxhement) ,and i have a
simple question .WHY every 2x2 hermitian matrix would have to satisfy this Equation.It is not obvious to me why.Does anyone know the answer?
The textbook stops there without giving any answer.Is it something obvious?
Is there any lengthy calculation to show this?


Homework Equations





The Attempt at a Solution

 

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helpcometk said:

Homework Statement


I have read the following text in a textbook(look the attaxhement) ,and i have a
simple question .WHY every 2x2 hermitian matrix would have to satisfy this Equation.It is not obvious to me why.Does anyone know the answer?
The textbook stops there without giving any answer.Is it something obvious?
Is there any lengthy calculation to show this?


Homework Equations





The Attempt at a Solution


It's sort of obvious just looking at the expression (5.27). Hermitian matrices have real diagonal elements and the two off-diagonal elements are complex conjugates. By selecting values of x0,x1,x2,x3 you can get any such matrix.
 
Yes its sort of obvious that I am stupid.
Thanks
 
helpcometk said:
Yes its sort of obvious that I am stupid.
Thanks

Hey, I miss the obvious too sometimes. Doesn't make you stupid.
 

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