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Recent Comments
 apgoucher on Hamming cube of primes
 Simon Tatham on Hamming cube of primes
 Determinacy  Complex Projective 4Space on Comprehending ultrafilters
 Oneway permutations  Complex Projective 4Space on BarretoNaehrig curves and cryptographic pairings
 Cyclotomic fields  Complex Projective 4Space on Free commutative monoid on countably many generators
Monthly Archives: July 2013
Lovász conjecture and Devil’s algorithm
A graph is vertextransitive if its group of automorphisms acts transitively on the set of vertices. For example, the skeletons of uniform polyhedral are all vertextransitive, as is the complete graph Kn. It’s obvious that a vertextransitive graph must be … Continue reading
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Coxeter groups and beyond
Some polyhedra have lots of symmetries. For example, consider the omnitruncated dodecahedron: The interactive demonstration constructs it kaleidoscopically, by reflecting a fundamental region (the Schwarz triangle) in three mirrors. The same fundamental region, however, can result in lots of different polyhedra and … Continue reading
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Cipher 34: Manual
Many of my ciphers were computerised. By contrast, this one was created manually and could have appeared 400 years ago, long before Blaise Pascal produced the first mechanical calculator.
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