Grassroots

That's it! The VP debate sent me over the edge. I'm running...

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In addition to doing vertex and face colorings of a graph, you can also do edge colorings. In an edge coloring, no two edges which are incident on the same vertex can share the same color.
Set theory is, alas, going to need to take a break. I left my books on the train on friday. $200 worth of textbooks down the tubes, unless one of the conductors happened to hang on to them.