Is ##\eta## Referring to the Minkowski Metric in Tensor Summation?

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The discussion confirms that the symbol ##\eta## refers to the Minkowski metric in the context of tensor summation. Participants clarify that only indices appearing once raised and once lowered are subject to summation, explicitly noting that terms like ##\eta^{ii}## should not be summed. The conversation highlights the importance of distinguishing between components and entire vectors or matrices when performing tensor operations.

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sunrah
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sorry solved
 
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By ## \eta ## are you referring to the Minkowski metric? Also, I assume that only indices that appear once raised and once lowered are being summed over, so that ## \eta^{ii} ## is not to be summed, correct?
 
Geofleur said:
By ## \eta ## are you referring to the Minkowski metric? Also, I assume that only indices that appear once raised and once lowered are being summed over, so that ## \eta^{ii} ## is not to be summed, correct?

thanks, the issue was simply that sometimes I forget we are dealing with components and not whole vectors, matrices etc.
 

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