Left-right arrow in Einstein equation

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etotheipi
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Short, probably stupid, question; what does this left-right arrow ##a \leftrightarrow b## at the bottom-right mean? [It's this paper for ref.]
1617491248432.png

Does it just mean the last term repeated, except this time with ##a## and ##b## indices exchanged? Thanks.
 

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anuttarasammyak
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LHS is symmetric as for a nd b so RHS is also. So your thought seems reasonable.
 
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Demystifier
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Why is this thread on the Last week's most popular topics list?
 

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