Images from Graph Drawing
Rather than make a traditional I-went-to-this-conference-and-saw-these-talks post, I thought it might be more interesting to put up a gallery of a few of the prettier images from the graph drawing proceedings, with explanations.
This first one looks like the kabbalah, but it’s actually
This one depicts Lombardi drawings of knots (all crossings are at right angles and all curves between crossings are circular arcs) for all the knots with eight or fewer crossings that have such drawings. It’s from “Lombardi drawings of knots and links” by Kindermann et al. (arXiv:1708.09819). Maarten Löffler’s talk on this was the runner-up for the best presentation award.
This is a friendship graph (a collection of triangles joined at a vertex), drawn as a quasi-thrackle. That means that, as in a thrackle, every two edges that don’t share an endpoint cross each other, but they can cross any odd number of times rather than only once. The central vertex
This shows two evolutionary trees, of pelicans (the light blue thick shaded tree) and their lice (the black node-link tree). Each louse has one host species that it infects, and typically those host-parasite relations are inherited (the ancestors of the parasites are ancestors of their hosts), but sometimes lice will jump sideways across the host tree from one species to another. This new visualization style is from “Visualizing co-phylogenetic reconciliations” by Calamoneri et al. (arXiv:1708.09691).
This shows another complete bipartite graph,
There were plenty of other interesting papers and results, if perhaps not with quite as eye-catching graphics, so check out the full open-access proceedings for more.