The homogenous system Ax=0 has only the trivial solution x=0.  3- A can be carried out to the identity matrix by EROs (elementary row operations).

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Theorem 2.4.5: The Inverse Theorem (Linear Algebra

2. The homogenous system Ax=0 has only the trivial solution x=0. 

3- A can be carried out to the identity matrix by EROs (elementary row operations). 

4-The system Ax=b has at least one solution x for every choice of column b. 

5- There exists an n x n matrix C such that AC=In

Explain how 2 implies 3 (2-->3) by establishing a proof/relationship. Similarly, explain how 4 implies 5 (4-->5). 

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