Talk:06-240/Classnotes For Thursday November 16

When we perform Gaussian Eliminations, sometimes, we can (i) do multiple operations at a time, if they do not "affect" each other (i.e. eliminate all the entries below a 1 in one step), and (ii) we can replace a row with a multiple of the row plus a multiple of anther row--i.e. R1 := aR1+bR2 (which is simply a combination of two elementary operations). Are we allowed to take these shortcuts in our assignment/exam work?