Prove that the quotient space R^n / U is isomorphic to the subspace W

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SUMMARY

The quotient space R^n / U is isomorphic to the subspace W, where U is the kernel of the matrix A and W is the image of A. The linear map T_A : R^n -> R^m defined by T_A(X) = A_X establishes this relationship. The isomorphism theorem confirms that the image of A is isomorphic to the quotient space of R^n by its kernel, thus providing a clear mathematical framework for understanding this relationship.

PREREQUISITES
  • Understanding of linear algebra concepts such as kernel and image of a matrix.
  • Familiarity with the isomorphism theorem in linear transformations.
  • Knowledge of the notation and operations involving matrices and vector spaces.
  • Basic proficiency in mathematical proofs and definitions.
NEXT STEPS
  • Study the isomorphism theorem in linear algebra for deeper insights.
  • Explore the properties of kernel and image of linear transformations.
  • Learn about quotient spaces in the context of vector spaces.
  • Investigate examples of linear maps and their corresponding kernels and images.
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Mathematics students, particularly those studying linear algebra, educators teaching vector space concepts, and researchers exploring linear transformations and their properties.

toni07
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Let A be an m x n matrix with entries in R. Let T_A : R^n -> R^m be the linear map T_A(X) = A_X. Let U be the solution set of the homogeneous linear system A_X = O. Let W be the set of all vectors Y such that Y = A_X for some X in R^n. I don't really know what I'm supposed to do here, any help would be greatly appreciated.
 
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crypt50 said:
Let A be an m x n matrix with entries in R. Let T_A : R^n -> R^m be the linear map T_A(X) = A_X. Let U be the solution set of the homogeneous linear system A_X = O. Let W be the set of all vectors Y such that Y = A_X for some X in R^n. I don't really know what I'm supposed to do here, any help would be greatly appreciated.

Hi crypt50! :)

Let's get our definitions straight:
\begin{aligned}
U &= \text{Ker } A \\
W &= \text{Im } A
\end{aligned}

According to the isomorphism theorem (see e.g. wiki), $\text{Im }A$ is isomorphic with the quotient space $\mathbb R^n / \text{Ker }A$.$\qquad \blacksquare$
 

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