# AMS blogs ran from 2009 to 2021

This blog, and all other AMS blogs has been retired. The blogs archived here expressed opinions of the writers and did not necessarily reflect the views and opinions of the American Mathematical Society.

This blog, and all other AMS blogs has been retired. The blogs archived here expressed opinions of the writers and did not necessarily reflect the views and opinions of the American Mathematical Society.

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Here is a very handy tool for jpg to png image conversion http://jpgtopng.com/. Try it out, it is fast, free and easy to use.

Hi John. You can find a visual construction of a solution to Kirkman’s fifteen schoolgirl problem in the paper

“Kirkman’s Tetrahedron and the Fifteen Schoolgirl Problem”, The American Mathematical Monthly, 118:10, 887-900.

See

https://www.tandfonline.com/doi/abs/10.4169/amer.math.monthly.118.10.887

or

https://www.tandfonline.com/doi/pdf/10.4169/amer.math.monthly.118.10.887?needAccess=true

Best regards,

Marco

Cool, thanks!

Hi,

do the mathematics of simple graphs and equivalence classes fall into the category of advanced topics in mathematics? I am guessing maybe so here is a link to “About Fifty”

http://gallery.bridgesmathart.org/exhibitions/2020-joint-mathematics-meetings/edvogel56

Thanks for having a look. I enjoy your math tweets.

I’d say equivalence classes are things all math majors should learn about as undergrads, while simple graphs are something they’d learn about if they were interested in discrete math.

Why does the AMS list this Blog as “retired”? Is it restricted to retired mathematicians?

No, it’s because I’ve stopped posting new articles. Perhaps when I retire I’ll start writing them again.