26 May
2019
26 May
'19
12:15 p.m.
On Sun, 26 May 2019 09:45:27 +0000, Feng Feng <F.Feng@outlook.com> said: FF> So if I want to contract two index in A, I mean, we need this FF> one: A^{abc}_{c} = A^{abcd} * g^{dc} ?
No, you need A^{abc}_{c} = A^{abcd} * g_{dc}. To have a dummy summation over varidx you need its two instances with different variance. -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://goo.gl/EaG2Vu Software: Geometry of cycles http://moebinv.sourceforge.net/