Proof based course

Hey there, JC,

Thank you for sharing your suggestion on adding a mathematical proof based course to our catalog! Logic is, indeed, a crucial part of mathematical reasoning and could be quite beneficial to further educate our users in math. As we grow and expand, we are always looking to improve our content and really appreciate your suggestions. I passed your feedback to the appropriate team so they can review it. 

Thanks again for taking an interest in improving Khan Academy. :)