2 ms·Not necessarily. p=>q does not mean q=>p, after all.by bigstrat2003 2y agoNot necessarily. p=>q does not mean q=>p, after all.stavros 2y agoIt does when !p=>!q.yazmeya 2y ago!p=>!q is exactly q=>p, and p=>q has nothing to do with that.stavros 2y agoI feel like you should read the original comment again.