How to Solve Linear Transformations with Only a Constant?

In summary, the conversation was about a transformation from R^2 to R^2 defined by F(x) = x1 + x2/1, where x = (x1, x2). The conditions that this transformation must satisfy were also discussed, including T(u+v) = T(u) + T(v) and T(au) = aT(u). It was determined that because there is only a constant in the bottom row of the transformation, it is not a linear transformation.
  • #1
EV33
196
0

Homework Statement


F:R^2 to R^2 defined by

F(x)=
x1+x2
1


Where x=
x1
x2

Homework Equations


Must satisfy these conditions:
T(u+v)=T(u)+T(v)
T(au)=aT(u)



The Attempt at a Solution



I said
u=
u1
u2

v=
v1
v2

u+v=
u1+u2
v1+v2

then F(u+v)=
(u1+v1) + (u2+v2)
...

This is where I got confused.

Because there is only a constant in the bottom row, which is a 1,
does this mean it is not a transformation? I don't know how to solve these when there is only a constant.
 
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  • #2
You're exactly right. You have
[tex]F(u+v) = \begin{pmatrix}
u_1+v_1+u_2+v_2 \\
1
\end{pmatrix} \not= \begin{pmatrix}
u_1+u_2 \\
1
\end{pmatrix} + \begin{pmatrix}
v_1+v_2 \\
1
\end{pmatrix} = F(u)+F(v)[/tex]
So F is not a linear transformation.
 
  • #3
You are doing fine. Yes, there is a 1 in the second row. Just write it down. Now is F(u+v)=F(u)+F(v)?
 
  • #4
No it is not. Thank you very much.
 

1. What is a linear transformation?

A linear transformation is a mathematical function that maps a vector from one vector space to another while preserving the basic structure of the space, such as the direction and magnitude of the vectors. It can be represented by a matrix multiplication, and it is an important concept in linear algebra and geometry.

2. How is a linear transformation different from other transformations?

A linear transformation is different from other transformations because it has the properties of linearity, meaning that it follows the rules of addition and scalar multiplication. This results in the transformation preserving the basic structure of the vector space, while other transformations may not do so.

3. What are the main applications of linear transformations?

Linear transformations have many applications in fields such as physics, engineering, and computer science. They are used to solve systems of linear equations, perform geometric transformations in 2D and 3D spaces, and analyze data in machine learning and data science.

4. How do you determine if a transformation is linear?

To determine if a transformation is linear, you can check if it follows the rules of linearity, which include the preservation of vector addition and scalar multiplication. Additionally, if the transformation can be represented by a matrix multiplication, it is considered linear.

5. Can a linear transformation change the shape of an object?

Yes, a linear transformation can change the shape of an object. For example, a rotation transformation can change the orientation of an object, while a scaling transformation can change its size. However, the overall structure of the object, such as its angles and proportions, will remain the same due to the linearity of the transformation.

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