I used the expression R(adsbygoogle = window.adsbygoogle || []).push({}); _{abcd}=-R_{bacd}=-R_{abdc}=R_{cdab}to reduce the number of components. I also used if a=b=0 the R=0 and if and c=d=0 then R=0.

This reduced the number of components to 64. How do I get them down to 21? I know I need another equality to reduce it to 20.

<<Mentor note: Fixed typesetting>>

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# I Reducing Riemann components to 20

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