[JadeNB]

I'm with my sibling commenter impendia (https://news.ycombinator.com/item?id=14719497), and am also a math professor.

My way of saying it is that it's great if you get help from any source you can, but it's way too easy to get something that seems helpful (because it makes short-term goals easier to achieve) while being damaging in the long run. It's fantastic if you had the personal discipline to use a solution manual to deepen your understanding, but there are lots of students who will use the solution manual as a copybook—the material in it going, as the saying goes, from page to pen without passing through brain on the way. Since I, as a teacher, don't have a ready way at the beginning of the semester to distinguish the students with your discipline from those without, I'm just going to discourage everyone from using solution manuals—but, as long as your homework solutions aren't copied from it, I don't care much if you go against that advice.