Linear transformation and Change of Basis

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Homework Help Overview

The discussion revolves around a linear transformation T from R^2 to R^2, specifically defined by its action on two vectors, v1 and v2, which are part of a given basis B. The original poster seeks to find the matrix representation of T with respect to both the basis B and the natural basis.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss how to express the natural basis vectors in terms of the given basis vectors v1 and v2. There is a focus on understanding how to apply the transformation T to these vectors, given the linearity of T and the known transformations of v1 and v2.

Discussion Status

Some participants have offered guidance on how to approach the problem by suggesting the use of linear combinations of the basis vectors. There is an ongoing exploration of how to determine the transformation of the natural basis vectors based on the information provided about T.

Contextual Notes

The original poster expresses uncertainty about how to proceed without a complete understanding of the transformation's effect on the natural basis vectors. There is an implication of needing to clarify the definitions and relationships between the bases involved.

Jimmy84
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Homework Statement



Greetings, I have been stuck with this problem for a while, I thought maybe someone could give me some advice about it. Thanks a lot in advance.

If T is a linear transformation that goes from R^2 to R^2 given that T(v1)= -2v2 -v1 and
T(v2)=3v2.

and B = v1=(1,1) , v2=(1,-1)


Find T with respect to the base B and T with respect to Nat, (the Natural Base)

Homework Equations





The Attempt at a Solution



I found T with respect to B by inspection

-1 0
-2 3

How can I find T with respect to the natural base?

Thanks
 
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Write the two natural basis vectors in terms of [itex]v_1,v_2[/itex] and then see what this transformation does to them. Once you know that, then you know how to find the matrix.
 
Robert1986 said:
Write the two natural basis vectors in terms of [itex]v_1,v_2[/itex] and then see what this transformation does to them. Once you know that, then you know how to find the matrix.

Do you mean to write 1,0 and 0,1 as a linear combination of v1 and v2 ? how can I see what the transformation does to them when I'm not given the transformation?

Thanks
 
Well, let's say [itex]e_1 = c_1v_1 + c_2v_2[/itex]. Then, [itex]T(e_1) = T(c_1v_1 + c_2v_2)[/itex]. Now, use the linearity of [itex]T[/itex] and what you know about [itex]T(v_1)[/itex] and [itex]T(v_2)[/itex] to calculate [itex]T(e_1)[/itex].

EDIT:
I don't know what terms your book uses, but I mean that [itex]e_1 = (1,0)[/itex].
 

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