Timeline for Commutativity and symmetric property in tensor manipulation
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Mar 12, 2015 at 6:37 | comment | added | user12029 | watch your upper and lower indices! It's also not true it equals $1$. See property 18 on mathworld.wolfram.com/MetricTensor.html | |
| Mar 12, 2015 at 6:06 | vote | accept | nightmarish | ||
| Mar 12, 2015 at 6:03 | comment | added | nightmarish | Thanks for the kind reply. I was also wondering why $\eta^{\mu\alpha}\eta^{\mu\beta} = 1$. Is it because the metric tensor is symmetric, so that we can rewrite the product as $\eta^{\alpha\mu}\eta^{\mu\beta}$, and then we sum over the index $\mu$ to form the product of 1? | |
| Mar 12, 2015 at 6:02 | history | edited | user12029 | CC BY-SA 3.0 |
added 353 characters in body
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| Mar 12, 2015 at 5:55 | history | answered | user12029 | CC BY-SA 3.0 |