D O C U M E N T 5 2 3 M AY 1 9 2 9 7 3 9 ALf. [18 340]. [1] Dated by the observation that Einstein is using a notation for the tetrads with both indices to the right-hand side and leg-index to the left of the coordinate index, which he began using in Doc. 521. [2] The following calculations were written on the back of the page. [3] The following four lines were written with pencil. [4] The operator was introduced in Doc. 459, eq. (5).  h s  h s h s h t = h t  h t h t =  h s h s h s =  h s h s h s h s h s h s h s h s D G 2  0 D ( H 2  (H  ) / ) 0 h s h s h s h s  i lm ilm - i lm - i lm 1 2 -- S i  i  lm ilm S lm m l l m ilm | 1 2 --S  i lm + 1 2 -- i m l l m S lm + + S  1 2 S   / =   1 2 --S  i lm i S lm i m l ) + – S   / = S   + S / /  [2] [4] [[3] ] D
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