Author of this other math book explains why he didn't include solutions, to promote inquiry based learning, with links to research papers from a grad class on e

Author of this other math book explains why he didn't include solutions, to promote inquiry based learning, with links to research papers from a grad class on evidence based teaching https://infinitedescent.xyz/20180214-exercises-ibl/ https://infinitedescent.xyz/20180214-exercises-ibl/ "people learn more when they discover something for themselves than they do if someone tells them about it." The whole idea of IBL is apparently just even communicating properly what problem you're having is a better learning experience than looking at an answer. As an anecdote a few times when I've asked math.stackexchange I found the answer just by thinking about my question.