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- Homework Statement
- There is one statement in the text of the attached picture that I do not understand

- Relevant Equations
- See text below

I am doing private studies in string theory and am reading "A first course in string theory" by Barton Zwiebach. Below equation 6.52 the author

says "Since the second term on the right-hand side must vanish...". I do not understand why this term must vanish, and I would be grateful for an explanation.

Best regards,

Sten Edebäck

says "Since the second term on the right-hand side must vanish...". I do not understand why this term must vanish, and I would be grateful for an explanation.

Best regards,

Sten Edebäck