Solution to system of linear equations in range of system matrix

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SUMMARY

The discussion focuses on solving a system of linear equations, specifically addressing the challenge of determining solutions in the range of the system matrix A. The user identifies that systems 1 and 2 have solutions for x in range(A), while system 3 does not. A key hint provided is to consider whether the equation A^T y = 0 has solutions such that y^T b ≠ 0. The Fredholm alternative is recommended as a resource for further understanding.

PREREQUISITES
  • Understanding of linear algebra concepts, specifically systems of linear equations.
  • Familiarity with the properties of matrix transposition and ranges.
  • Knowledge of the Fredholm alternative theorem.
  • Basic proficiency in mathematical notation and problem-solving techniques.
NEXT STEPS
  • Study the Fredholm alternative theorem in detail to understand its implications on linear systems.
  • Learn about the properties of matrix transposition and their effects on solution existence.
  • Explore examples of systems of linear equations with varying properties to identify solution patterns.
  • Investigate the concept of the range of a matrix and its significance in linear algebra.
USEFUL FOR

Students and professionals in mathematics, particularly those studying linear algebra or working on systems of equations. This discussion is beneficial for anyone seeking to deepen their understanding of matrix properties and solution methodologies.

kalleC
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Homework Statement


See image. a) and b) have been solved. The problem is c)


Homework Equations





The Attempt at a Solution


I really have no idea where to begin. For the three systems given there are solutions x in range(A) for system 1 and 2 but not for 3. Therefore I have been trying to spot some obvious difference between system matrix A of system 2 and 3 but I cannot think of any clearly different property that could be linked to b.

Any hint just to get me started would be much appreciated.
 

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Hint: Ask yourself whether A^T y = 0 [/tex] has solutions such that y^T b \neq 0.<br /> <br /> Try it yourself first. Then if you think you know what is going on, look at the wikipedia entry under Fredholm alternative.
 
Much appreciated!
 

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