Given the metric: 1, x 1 , x 2
We have:
R (Ricci) = g 11 ( R 11 ) + g 22 ( R 22 ) + g 33 ( R 33 )
Where: R 11 = g 22 R 2112
R 22 = g 11 R 1221 + g 33 R 3223
R 33 = g 22 R 2332
Then: g 11 = 1, g 22 = 1/ x 1 , g 33 = 1/ x 2
R 1221 = - 1/ x 1
R 2332 = - 1/ x 2
And: R 3223 = - 1/ x 2
Further: R 2112 = - 1/ x 1
And: R 2332 = - 1/ x 2
So:
R 11 = g 22 R 2112 = 1/ x 1 (- 1/ x 1 )
R 11 = - 1 / (x 1 ) 2
R 22 = g 11 R 1221 + g 33 R 3223
= ( - 1/ x 1 ) + ( 1/ x 2 ) (- 1/ x 2 )
R 22 = - 1/ x 1 - 1 / (x 2 ) 2
R 33 = g 22 R 2332 = ( 1/ x 1 ) (- 1/ x 2)
R 33 = - 1 / x 1 x 2
Then: g 11 ( R 11 ) + g 22 ( R 22 ) + g 33 ( R 33 ) =
( 1) [- 1 / (x 1 ) 2 ] + 1/ x 1 [- 1/ x 1 - 1 / (x 2 ) 2 ] +
(1/ x 2 ) [- 1/ x 1 x 2 ] =
-2 / (x 1 ) 2 - 1 / x 1 (x 2 ) 2 - 1/ [x 2 ( x 1 x 2 )]
-2 / (x 1 ) 2 - 1 / x 1 (x 2 ) 2 - 1/ [x 2 ( x 1 x 2 )]
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