Formally Proving the Invariance of Solutions in Gaussian Elimination

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SUMMARY

This discussion focuses on formally proving that elementary row operations in Gaussian Elimination do not alter the solution set of a system of linear equations. The three types of elementary row operations—permuting equations, multiplying an equation by a constant, and adding a multiple of one equation to another—are established as valid transformations that maintain the solution set. The proof relies on the inherent properties of equality and linear combinations, confirming that these operations preserve the equivalence of the original system of equations.

PREREQUISITES
  • Understanding of Gaussian Elimination
  • Familiarity with elementary row operations
  • Basic knowledge of linear equations and their solutions
  • Concept of linear combinations in linear algebra
NEXT STEPS
  • Study the properties of elementary row operations in detail
  • Explore the concept of linear independence and dependence
  • Learn about the implications of matrix representation in linear algebra
  • Investigate the role of Gaussian Elimination in solving systems of equations
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Students in linear algebra courses, educators teaching Gaussian Elimination, and anyone interested in the theoretical foundations of linear equations and their solutions.

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I've been doing Gaussian Elimination in a Linear Algebra class, but I have a question:

How do I formally prove that elementary row operations do not change the set of solutions to a system of linear equations?

Thanks.
 
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Instead of using matrix representation for the system of equation, keep it in equation form.

Then elementary row operations are the same as either permuting two equations (obviously doesn't change the solutions!), multiplying one equations by a constant (doesn't change the solutions as you can probably easily see), and multipling an equation by a constant and adding the resulting equation to another. If you think about it for a second, you'll see why this doesn't change the solutions either.
 

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