Mathematics StackExchange
URL: http://math.stackexchange.com/
This is a collaboratively edited question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required. Got a question about the site itself? meta is the place to talk about things like what questions are appropriate, what tags we should use, etc.
Where to start learning Math?
URL: http://www.cut-the-knot.org/ctk/reform.shtml
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