Show that the range of the linear operator is not all of R^3

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Homework Help Overview

The discussion revolves around demonstrating that the range of a specified linear operator is not all of R3. Participants are tasked with finding a vector that lies outside this range, based on the equations provided for the operator.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the invertibility of the operator and its range, with one suggesting that demonstrating the operator is singular could imply the range is not all of R3. Others inquire about the method for identifying a specific vector not in the range.

Discussion Status

The conversation is active, with participants offering guidance on how to approach the problem. There is an emphasis on finding a specific vector that does not belong to the range, and some participants are considering the implications of the equations provided.

Contextual Notes

There is a noted requirement to find a vector not in the range, which suggests constraints on the values of w1, w2, and w3 that may lead to no solutions for x, y, and z.

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Homework Statement


Show that the range of the linear operator defined by the equations is not all of R3, and find a vector that is not in the range


Homework Equations


w1 = x - 2y + z
w2 = 5x - y + 3z
w3 = 4x + y + 2z


The Attempt at a Solution


can I just show that it does not have an inverse and it's a singular matrix to say it's equivalent to the range is not all or R3?
 
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Yes, but you will still have to find a vector that is not in the range. So just find such a vector and solve both problems at once instead.
 
strange, my edit was not posted.

My question is actually how to find the vector not in the domain?
 
Yes, that is the whole point.

For what values of w1, w2, w3 does
w1 = x - 2y + z
w2 = 5x - y + 3z
w3 = 4x + y + 2z
NOT have a solution.

Just start solving for x, y, and z and see if you run into a problem (probably dividing by 0) for some values of w1, w2, and w3.
 

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