Troubleshooting Tensors: A Quick Fix Guide

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SUMMARY

The discussion centers on the proper handling of tensor indices in mathematical expressions, specifically addressing the incorrect replacement of indices in tensor notation. Participants highlight the importance of maintaining the integrity of free and dummy indices, noting that free indices cannot be renamed arbitrarily. The conversation emphasizes the need for clarity in tensor manipulation to avoid errors in mathematical derivations.

PREREQUISITES
  • Understanding of tensor notation and indices
  • Familiarity with free and dummy indices in tensor calculus
  • Basic knowledge of mathematical expressions involving tensors
  • Experience with mathematical proofs or derivations
NEXT STEPS
  • Study the rules of tensor index manipulation
  • Learn about the significance of free versus dummy indices in tensor calculus
  • Explore common errors in tensor notation and how to avoid them
  • Review advanced topics in differential geometry related to tensors
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Mathematicians, physicists, and students studying advanced mathematics or theoretical physics who need to understand tensor manipulation and notation accuracy.

mahblah
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Hi... here it is... sorry for my english...

http://sphotos-c.ak.fbcdn.net/hphotos-ak-ash4/297165_4722421629188_964469850_n.jpg
 
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Hello. Looks like you replaced A^\rho by g^{\alpha\beta}A_\beta. What happened to ##\rho## and how did ##\alpha## appear? Similarly for your indices on the partial derivative: ##\sigma## disappears while ##\eta## suddenly appears.
 
Thanks Tsny, ...but it's a simply rename of the index... i mean... i think this is not the problem..
 
You can't rename free indices, only 'dummy' (ones summed over) ones.
 

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