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a)is not "complete" in the sense taht you can add a term whose covariant derivative is 0 but the term is not a constant..so there are infinite Einstein,s equation for gravity.

b)the coupling constant in this theory makes theory non-renormalizable whereas the other theories describng the forces are so the "3 to 1 " means that relativity must also be renormalizagble

Perhaps the situationis like this g.r describes relativity for gtreat distances (cosmology universe) perhaps are some terms left relating high curvature on einstein,s equation these terms should descirbe classically the g.r for greta curvature (small distancess) and must give a renormalizable theory .

So the question is...was einstein wrong?..was einstein a "genious" that made an imcomplete theory of gravitation?..