- #1
Buffu
- 849
- 146
Prove that interchange of two rows of a matrix can be accomplished by a finite sequence of elemenatary row operations of the other two types.
My proof :-
If ##A_k## is to be interchanged by ##A_l## then,
##\displaystyle \begin{align} A_k &\to A_l + A_k \\ A_l &\to - A_l \\ A_l &\to A_k + A_l \\ A_l &\to A_l + A_k \\ A_l &\to \dfrac12 A_l \\ A_k &\to - A_k \\ A_k &\to A_k + A_l \\ A_k &\to - A_k \end{align}##
I think this now interchanges original ##A_l## with ##A_k##.
Is this correct ?
My proof :-
If ##A_k## is to be interchanged by ##A_l## then,
##\displaystyle \begin{align} A_k &\to A_l + A_k \\ A_l &\to - A_l \\ A_l &\to A_k + A_l \\ A_l &\to A_l + A_k \\ A_l &\to \dfrac12 A_l \\ A_k &\to - A_k \\ A_k &\to A_k + A_l \\ A_k &\to - A_k \end{align}##
I think this now interchanges original ##A_l## with ##A_k##.
Is this correct ?