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 Sci Advisor HW Helper P: 11,896 Well,Pete,either u or Dirac[1] have it all mixed up.I'd go for you,as Dirac got a Nobel prize and i've been taught GR from his book[1]. Your formula #2 is valid for contravariant vectors ([1],eq.3.3,page 6) (a.k.a.vector,which is defined on the tangent bundle to a flat/curved $\mathbb{M}_{4}$)...So how about getting it all done correctly or,don't give that link anymore and exlude it from your post. Daniel. -------------------------------------------------- [1]P.A.M.Dirac,"General Relativity",1975.