Find the decomposition of the standard two-dimensional rotation

In summary, "decomposition" in this context refers to breaking down a complex rotation into simpler components. The standard two-dimensional rotation is represented using a 2x2 matrix and can be decomposed by identifying the angle of rotation, constructing a matrix with the cosine and sine of the angle, finding eigenvalues and eigenvectors, and using them to construct the decomposition. This allows for a better understanding and manipulation of the rotation, as well as more efficient calculations. The concept of decomposition can also be applied to higher dimensions, with varying steps and calculations.
  • #1
SNOOTCHIEBOOCHEE
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Homework Statement



Find the decomposition of the standard two-dimensional rotation representation of the cyclic group Cn by rotations into irreducible representations



The Attempt at a Solution



Ok i did this directly, finding complementary 1-dimensional G-invariant subspaces. but our teacher said we specifically need to do this using characters, which i have no clue how to do.
 
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  • #2


Write down the character of C_n acting by rotations on the plane. Find its inner product with the irreducible 1-d reps.
 

FAQ: Find the decomposition of the standard two-dimensional rotation

What is the meaning of "decomposition" in this context?

"Decomposition" refers to the process of breaking down a complex rotation into simpler components that can be easily understood and manipulated. It involves finding the individual rotations and operations that make up the standard two-dimensional rotation.

How is the standard two-dimensional rotation typically represented?

The standard two-dimensional rotation is typically represented using a 2x2 matrix. The entries of this matrix correspond to the coefficients of the linear transformation that describes the rotation.

What are the steps to decompose the standard two-dimensional rotation?

The steps to decompose the standard two-dimensional rotation are as follows:

  • 1. Identify the angle of rotation, which is typically denoted by theta (θ).
  • 2. Construct a 2x2 matrix with the cosine and sine of theta as entries.
  • 3. Find the eigenvalues and eigenvectors of this matrix, which represent the individual rotations that make up the standard rotation.
  • 4. Use the eigenvalues and eigenvectors to construct the decomposition of the standard rotation.

What is the significance of finding the decomposition of the standard rotation?

Decomposing the standard rotation allows us to better understand and manipulate the rotation. It also provides a more efficient way to perform calculations involving rotations, as the individual components can be easily manipulated and combined.

Can the decomposition of the standard rotation be applied to higher dimensions?

Yes, the concept of decomposition can be extended to higher dimensions. However, the specific steps and calculations will vary depending on the dimension and type of rotation being decomposed.

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