Multiple Zombies, the second installment of the undead mathematics series is now available at the iTunes Book store. Get this book and the first installment, In Parts:Fractional Zombies, free for a limited time. Both books are written for an audience of about 2-3rd grade. Multiple Zombies is specifically for those learning multiplication of numbers 0-10. […]
One of the casualties of drought is the piñon in the mountains of New Mexico. I took this picture back in February in the Sandias, the mountains on the eastern edge of Albuquerque. Where you see snow the slopes are generally north-facing. No snow is south-facing, and that’s where you see brown trees. I tweaked ...Continue reading ‘dead piñon’ »
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Stuff I Wrote Elsewhere, Dead Tree
I hear that the President will introduce the first episode. I saw this quote from Carl Sagan on Google Plus last week, and it is more true now than when wrote it. There does seem to be a growing segment in America that looks as ignorance as an attractive lifestyle choice. A far cry from the days of Gemini and Apollo as I was growing up. In those days, Texas …
They say that being a soldier in war is 90% boredom followed by 10% action and on this cruise it is feeling like being a marine geologist is pretty similar to this. We are now at our new drilling site and waiting for the fresh material to arrive in the lab so that we can get going.
Today I've been playing with the induced subgraphs of the Clebsch graph. Several other interesting and well-known graphs can be obtained from it by deleting a small number of vertices and forming the induced subgraph of the remaining vertices.
To begin with, one simple construction of the Clebsch graph is to take all length-four binary strings as vertices, and to make two strings neighbors when they differ either by a single bit or by all four bits. So it has sixteen vertices and 40 edges, and