If say 4 columns are extraneous-factor producing, then removing any one column will restore linear independence. But how do you ensure that the columns left are extraneous-factor producing? You could have removed an essential column.
If say 4 columns are extraneous-factor producing, then removing any one column will restore linear independence. But how do you ensure that the columns left are extraneous-factor producing? You could have removed an essential column.
Why do non-zero minors of size
exist?