Where Does the Last Equality in Equation 6.79 Come From?

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SUMMARY

The discussion centers on the derivation of the last equality in equation 6.79 from equation 6.78 in Zwiebach's textbook. The user seeks clarification on this specific mathematical transition, indicating a direct relationship between the two equations. The inquiry emphasizes the importance of understanding the context and derivation of equations within the text for accurate comprehension. The mention of Zwiebach suggests a focus on string theory concepts.

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  • Knowledge of the specific equations 6.78 and 6.79
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ehrenfest
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Homework Statement



Sorry this page is not part of the free preview but I would recommend that everyone buy their own Zwiebach (or download it illegally if ethics don't stop you).

Anyway, on page 109, can someone help me figure out where the last equality in equation 6.79 comes from?

Thanks.

Homework Equations


The Attempt at a Solution

 
Last edited:
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It comes from equation 6.78 (that might sound like a guess, but I really did check the book).
 

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