This answer claims that eigenvalues of a matrix are preserved under elementary row operations.
It has two upvotes and it is an accepted answer. I came across it while searching related topics on Google. I am worried this answer might mislead learners like me.
The user does not seem active so I did not comment on the answer.
I wanted to bring it to attention because the language of the post also seemed AI-generated... "Subtle non-sense is the worst kind of non-sense"...