Thank you for sharing an alternative! It hasn't been mentioned on HN for several years; several good discussions on learning math: https://hn.algolia.com/?quer

Thank you for sharing an alternative! It hasn't been mentioned on HN for several years; several good discussions on learning math: https://hn.algolia.com/?query=artofproblemsolving%20comments%3E0&sort=byDate https://hn.algolia.com/?query=artofproblemsolving%20comments...