eigenvalues of linear transformation

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I know when we change basis eigenvalues of linear transformation is invariant
But i dont know when we use two basis. When Linar trans formation domain use basis A ans codomain use basis B. Are eigenvalues same as only one basis?

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A linear transformation has its eigenvalues that don't change when we change basis. We represent a linear transformation with a matrix with respect to some basis. As I said, this matrix will have the same eigenvalues regardless of what basis we use.

When you want to go from one basis to another, you use a change of basis matrix. It cannot happen that you "use two bases".

In order to get the right answer, try to clarify your question a bit more, perhaps.