Left-right arrow in Einstein equation

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SUMMARY

The left-right arrow notation ##a \leftrightarrow b## in the Einstein equation indicates the exchange of indices between terms, confirming the symmetry of the left-hand side (LHS) and right-hand side (RHS) of the equation. This notation is essential for understanding the implications of symmetry in tensor equations. The discussion highlights the importance of recognizing such notations in advanced physics papers, particularly in the context of general relativity and tensor calculus.

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