Proving Relationship: Epsilon-Delta Decomposition for Tensors

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SUMMARY

The discussion centers on proving the relationship \(\epsilon_{pqi}\epsilon_{pqj} = 2\delta_{ij}\) using epsilon-delta decomposition for tensors. Participants suggest evaluating cases where \(i = j\) and \(i \neq j\) to simplify the proof. The Levi-Civita symbol (\(\epsilon_{ijk}\)) and Kronecker delta (\(\delta_{ij}\)) are essential components in this proof, providing a structured approach to tensor manipulation. The conversation emphasizes the importance of understanding these mathematical constructs to derive the desired relationship effectively.

PREREQUISITES
  • Understanding of tensor notation and operations
  • Familiarity with the Levi-Civita symbol (\(\epsilon_{ijk}\))
  • Knowledge of the Kronecker delta (\(\delta_{ij}\))
  • Basic principles of tensor decomposition
NEXT STEPS
  • Study the properties of the Levi-Civita symbol in tensor calculus
  • Learn about the applications of the Kronecker delta in tensor analysis
  • Explore tensor decomposition techniques in advanced mathematics
  • Review examples of epsilon-delta relationships in physics and engineering
USEFUL FOR

This discussion is beneficial for students and professionals in mathematics, physics, and engineering who are working with tensor analysis and looking to deepen their understanding of tensor relationships and decompositions.

vortmax
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Homework Statement



Prove the following relationship:

[tex]\epsilon[/tex]pqi[tex]\epsilon[/tex]pqj = 2[tex]\delta[/tex]ij

Homework Equations





The Attempt at a Solution



All I have so far is the decomposition using the epsilon-delta

[tex]\epsilon[/tex]pqi[tex]\epsilon[/tex]pqj = [tex]\epsilon[/tex]qip[tex]\epsilon[/tex]pqj
[tex]\epsilon[/tex]qip[tex]\epsilon[/tex]pqj = [tex]\delta[/tex]qp[tex]\delta[/tex]iq - [tex]\delta[/tex]qj[tex]\delta[/tex]iq

have no idea where to turn next
 
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Hi vortmax, do you have a definition for the eijk (levi cevita) and understand the summation?

You could do it reasonably simply just by evaluating ij cases for both the levi cevitas & kronecka deltas (probably all you really need to do is i=j & i<>j cases)
 

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