A solid buy, but could be improved

The developers of the app have created something that is worth buying simply because of how exhaustive the content is. Though a few places could use more detail or examples, especially in newly added sections, it generally does well as a quick guide. Its not designed to teach the concepts listed, just give a reminder of what they are.

One thing Id like to see added are dynamic content, such as solvers, a calculator, grapher, etc., rather than just static lists.

yerich about Math Ref