May be it is very trivial, but I am stuck here, given (I have suppressed the conjugate coordinates) ϕi(x)ϕj(y)∼∑kcijk(x−y)hk−hi−hjϕk(y)
⟨ϕi(x)ϕj(y)⟩=δij1(x−y)2hi
Show that cijk is symmetric in three indices, (i,j) is straightforward how to go about (j,k) ?
This post imported from StackExchange Physics at 2015-02-16 11:40 (UTC), posted by SE-user Jaswin