Automorphism of order 7 in the Coxeter Graph
#graphtheory #grouptheory #finitegroups #symmetry
Visualising order-3 and order-4 automorphisms in the 5-cell
#GraphAutomorphisms #MathSky
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Take vertices as 3-subsets of a set of 7 elements, connect two vertices if the subsets are disjoint. Result: the odd graph O(4). Automorphism group: S7.
Two drawings, one showing 7-symmetry, one showing 5-symmetry.
(The second drawing can probably be done with fewer crossings... not sure tho!)
The Petersen Graph (automorphism group: S5) showing symmetries of order 5 and 3.
#GraphAutomorphisms #GraphTheory
This reminded me of how cool the Petersen graph is; a 6-post 🧵.
First, what is it? The vertices are labeled by the 2-element subsets of {1,...,5}, and there is an edge between two vertices if the subsets are disjoint.
This gives S5 in its automorphism group; in fact that's all there is.
#MathSky
Automorphism of order 3 in the Coxeter Graph
#graphtheory #grouptheory #finitegroups #symmetry
Automorphism of order 8 in the Coxeter Graph
#graphtheory #grouptheory #finitegroups #symmetry
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Two drawings of the Heawood graph, one showing 7-rotational symmetry and one showing 3-rotational symmetry
#GraphTheory #GraphAutomorphisms #ChordalRings #SymmetricGraphs #HeawoodGraph
Another visualisation of the Order 8 automorphism of the Coxeter Graph. Orbit of vertex 0 shown in red
#graphtheory #grouptheory #finitegroups #symmetry
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Joshua Grochow
The Petersen Graph (automorphism group: S5) showing symmetries of order 5 and 3.
#GraphAutomorphisms #GraphTheory
