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

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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 understand how these models can work for most traditional diseases, where infected individuals are no longer contagious after some period, and are generally immune, themselves. However, for a condition such as AIDS, where infected individuals are permanently infected (and without intervention, permanently contagious), what happens to the "gI" term in the equation for dI/dt (R being nonexistent).

If one were modelling HIV/AIDS, would they want to do something different with g?

Furthermore, in the equation for dS/dt, if beta is multiplied by S and I, shouldn't B be multiplied by the total population, and dS be multiplied by S?

Any clarification would be much appreciated. Thanks.