# About 2+1 General Relativity [closed]

I'm currently studying on how to write GR as a CS theory, but i have a problem with one of the basic theorem of this subject.

$$e^\mu_{\ \ a} \epsilon^{\nu \rho \sigma} R_{\ \ \rho \sigma}^a = \det(e) G^{\mu\nu}$$

And i don't know how to prove. Any help is welcome :)

• Can you expand your question. What is CS theory? – MBN May 19 '18 at 15:56
• Chern-Simons , a gauge field theory – user184173 May 19 '18 at 19:37
• where did you find this theorem and more generally : where are you studying cs theory from? – magma May 20 '18 at 23:37