Forum rules changed because of spam attack

Because of this morning’s spam comments on the forums, I have changed the rules so that you have to be a registered user of the site to post a topic or comment.

About Bill McCallum

I was born in Australia and came to the United States to pursue a Ph. D. in mathematics at Harvard University, met my wife, and never went back. I am a professor at the University of Arizona, working in number theory and mathematics education.
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