2015-10-08 19:02:19 +0100 | received badge | ● Editor (source) |

2015-10-08 19:00:09 +0100 | asked a question | Computations on U and V when they do not commute. We have $f= U + U^{-1} + V + V^{-1}$. Exp is the exponential map: $e^{f}=\Sigma_{m=0}^{\infty} \frac{f^{n}}{n!} $. U and V do not commute and we have $U^{m}V^{n}= e^{imn}V^{n}U^{m}$ for any m,n integer. I want to find the constant term for the expression $\partial_{2}e^{-f/2} \partial_{2}e^{f}$. We have $\partial_{2}f= V - V^{-1}$. Is there any program in which I can compute it? |

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