## [Reduce-algebra-developers] suggest: change the definition of \epsilon tensor

 [Reduce-algebra-developers] suggest: change the definition of \epsilon tensor From: Zhongbo Kang - 2010-07-03 16:38:22 Dear all, In current version of REDUCE, the epsilon tensor (such as \epsilon^ {\mu\nu\alpha\beta}) are defined based on the convention: \epsilon_{0123}=+1 However, currently in the particle physics field, the other convention has been used much more often. The convention used in particle physics is that: \epsilon^{0123}=+1 Note: this convention indicates that \epsilon_{0123}= -1. This convention will change the trace of gamma matrix (for those involving \gamma^5), which always leads to a sign difference. I thus strongly suggest we change the convention to the one mostly used in the particle physics community. For example, the mathematica FeynCalc uses the standard convention from particle physics. Best, Kang