THE OCTONIONS. JOHN C. BAEZ. Abstract. The octonions are the largest of the four normed division algebras. While somewhat neglected. The expository article about octonions by John (Baez) that appeared in the AMS Bulletin (copy here, a web-site here) is one of the best pieces. After the octonions comes a dimensional number system called the ” sedenions”. They have some nice features, which I describe in this.

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Not being associative, the nonzero elements of O do not form a group. Advances in Applied Clifford Algebras. Sure, it is the last division algebra, but if you relax your axioms a little the Cayley-Dickson construction gives an infinite tower of increasingly uninteresting algebras: His way of looking at all these things shows that he is nothing else than an irrational numerologist who can never distinguish real insights from superficial distractions – and who apparently doesn’t want to distinguish them.

Applying the Cayley-Dickson construction to the octonions produces the sedenions. Since, the ORDER of the octonions bqez the value, has anyone tried to make a consistent theory of spacetime using octonions? The isotopy group of an algebra is the group of all isotopies, which contains the group of automorphisms as a subgroup.

Corinne Manogue, Tevian Dray, and others wrote some very illuminating papers where they spell out the properties of octonions and postulate about their applications to physics:. In the slow comments under the blog entry, Robert Helling argued that there is a lot of interesting fog about the closure of the supersymmetry algebra etc.

But then the show stops: April 30, at 3: Quantum groups and braid groups as fundamental symmetries. Freeman and Company, San Francisco, If it is considered only as a product on the imaginary subspace Im O it defines a product on that space, the seven-dimensional cross productgiven by. Skeptics say they are much less. Anthony Sudbery, Division algebras, pseudo orthogonal groups and spinors, Jour.

In particular, John Huerta has done a bunch of calculations showing that the trick relating octonions to strings in 10 dimensions and 2-branes in 11 dimensions does not continue to work one dimension higher. Michael Atiyah and Friedrich Hirzebruch, Bott periodicity and the parallelizability of the spheres. So the article hyping a set of a few simple mathematical observations is just pathetic.

And as usual those who are stuck in the investment till their necks will not be the first ones to blow the whistle that a market correction is coming. April 29, at Greg Kuperberg, Spiders for rank 2 Lie algebras, Comm.

But the total number of dimensions of space and time is 2 more than the number of extra dimensions. Because then its vibrations can be described using numbers in a division algebra.

Wiskunde 8 InI wrote a simple text saying why the wave function has to be complex. But the topics that Baez, Huerta, Helling, and others are talking about are pretty much exactly those where the mystery has already been fully eliminated.

Additional Information John C. There are several natural ways to choose an integral form of the octonions.

Hamburg 8 This evolution changes the dimensions in which supersymmetry naturally arises, by adding two — one for the string and one for time.

We need better Physics. A 14 The isotopy group of the octonions is the group Spin 8 Roctonoons aband c acting as the three 8-dimensional representations. To preserve the sum of probabilities, one needs something Each of the seven lines generates a subalgebra of O isomorphic to the quaternions H.

### Octonion – Wikipedia

You simply can’t understand the secrets of string theory by abez the sequence 1,2,4,8. Most visited in 30 days it doesn’t mean “best” The word salad interpretation of quantum mechanics. Newton was not so foolish. There is a symmetry of order 7 given by adding a constant mod 7 to all subscripts, and also a symmetry of order 3 given by multiplying all subscripts by one of the quadratic residues 1, 2, 4 mod 7.

Actually, one can show that the subalgebra generated by any two elements of O is isomorphic to RCor Hall of which are associative.

They do, however, form a loopindeed a Moufang loop.

## This Week’s Hype

I read the article and enjoyed it. Vinberg, A construction of exceptional simple Lie groups RussianTr. Sedenionsnot alternative but power associative.

An automorphismAof the octonions is an invertible linear transformation of O which satisfies. Friday, April 29, Journal of Mathematical Physics. Algebra Notices 14 Because of their non-associativity, octonions do not have matrix representations, unlike quaternions. They protest against the increased price