This forum is already known.
Here are more.
www.freemathforum.com
www.mathforum.com (this one is famous)
www.physicsforum.com
S.O.S. Math Forum (forgot the link).
Another math forum Art of Problem Solving Forum
This forum is already known.
Here are more.
www.freemathforum.com
www.mathforum.com (this one is famous)
www.physicsforum.com
S.O.S. Math Forum (forgot the link).