bio  website  chemie.unihamburg.de/ac/AKs/… 

location  Hamburg  
age  53  
visits  member for  4 years 
seen  1 hour ago  
stats  profile views  1,231 
knot theory dilettant!
22h

asked  “Generators” for fusion rings 
Dec 2 
comment 
A 6j multiplicity paradox
Downloaded :) I hope I can find the hole in my logic now myself, but still would appreciate a direct answer, although I checked the "answered" button. (Note added in reading: Argl, how do associtativity matrices relate to 6j symbols? In any case, Axxxx is 6dimensional so this should mean my case A is true. Shrug.) 
Dec 2 
accepted  A 6j multiplicity paradox 
Dec 1 
asked  A 6j multiplicity paradox 
Dec 1 
comment 
The resolution of which conjecture/problem would advance Mathematics the most?
What about specializing to applications? My life wouldn't change if the Riemann hypothesis is proven/disproven, and knowing P=/!=NP also not necessarily would have THAT impact with computers. 
Oct 22 
comment 
Classification properties of fusion rings
(contd) Assume you do their construction, but no crossings are allowed in the cubic graph. I think you still can get an invariant, with "Elliott" 6j symbols. If someone could tell me the smallest selfdual, no multiplicity fusion ring that is NOT ribbon, I could try my ClebschOMatic on it and settle the matter. (A try with AA=1,AB=B,B*B=1+A+2B suggests you are right but don't know whether I programmed multiplicity correctly.) 
Oct 22 
comment 
Classification properties of fusion rings
@Turion: Thus "style"  I don't know enough on the field. 
Oct 21 
asked  Classification properties of fusion rings 
Oct 9 
accepted  No basis change in a fusion ring allowed? 
Oct 8 
asked  No basis change in a fusion ring allowed? 
Jul 14 
revised 
Nonsemisimple Lie algebra tensors
Reduced it to the relevant. May go into details with new question. 
Jul 11 
comment 
Nonsemisimple Lie algebra tensors
Also: If you start with the tensor $C^i_{jk}$ and you can NOT invert $g_{lm}$ to get "the indices up", how do you arrive at $g^{no}$ at all? (I'm always working with matrix generators, thus my "complex conjugate transpose"). 
Jul 11 
comment 
Nonsemisimple Lie algebra tensors
I'm not at all familiar with Lie algebras, but obviously e.g. $C_{ijk}$ is identically zero for aff1 (because of dimension 2). Do you include this degenerate possibility in your statement? (Do such Lie algebras have a special name?) 
Jul 10 
revised 
Nonsemisimple Lie algebra tensors
More definitions. Expanded. 
Jul 9 
asked  Nonsemisimple Lie algebra tensors 
Jul 2 
awarded  Inquisitive 
Jul 2 
awarded  Curious 
Jun 7 
comment 
“Multiplying” ClebschGordan series
Yup, those. And after perusing his opus magnum for three years or so I understand it a bit :) But we have digressed so much that we better take this issue to PM... (reddmannatchemiedotunihamburgdotde) 
Jun 2 
comment 
“Multiplying” ClebschGordan series
You're right. Problem is I have no formal education in higher math and usually don't even know the correct terms. In any case, you can peek into "Birdtracks" by Cvitanovic (he's kind of a maverick too, but at least he knows the math :)  on p. 232 of his "Group Theory" pdf I found the 8^2=1+9+27+27. The table header lists "Rep" so it's well possible that his vector spaces are built from several irreps. 
May 30 
comment 
“Multiplying” ClebschGordan series
The span (?) of the vector space of $A\bigotimes{B}$ doesn't come out right otherwise! OK, you have then 8 irreps of (2,2,2)*(2,2,2) (I have to trust you on that) but still, it's vector space needs only four basis vectors to build the R matrix. (Is the span 8 nevertheless?) In all dimension formulas I know, the "clustered" irreps appear. 