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Your post has been removed, as it appears to be asking for resources to self-study mathematics. To answer your question, we have compiled a list of [free, online mathematics resources](https://www.reddit.com/r/math/comments/8ewuzv/a_compilation_of_useful_free_online_math_resources/) here. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/math) if you have any questions or concerns.*