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A game you're almost certain to lose...

What are the challenges of communicating from the frontiers of mathematical research, and why should we be doing it?

Maths meets politics as early career mathematicians present their work at the Houses of Parliament.

Celebrate this year's International Women's Day with some of the articles and podcasts we have produced with women mathematicians over the last year!

How to sum an infinite series using chocolate.

I've only looked at this Web page this week, and I agree with you. The equation for S(infinity) as displayed is missing a minus sign, or alternatively should be changed as you suggest. The legend on the graph following for the y-axis correctly includes the minus sign.