(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://books.google.com/books?id=Xm...5Dw&sig=6cUrZKqmPMoe0QBRTSYNnipNRw4#PPA114,M1

In the solution to problem 6.3 shown in the attachment, can someone explain to me why [tex] d\vec{X}/dx [/tex] was implicitly set equal to [tex] \partial \vec{X}/\partial{x} [/tex]?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: String theory question

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