B Exploring String Theory: Open and Closed Strings

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are open strings like world lines? and closed strings like loops?
 
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Dibujo20150803-world-sheets-open-strings-closed-strings-string-theory-Zwiebach.png


From https://www.google.com/search?safe=...0k1j0i24k1.0.oYFwSZDIBDw#imgrc=Q_zxTiQeY4_0IM:
 

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Is this the point of view in Green, Schwartz, Witten superstring theory volume 2?
 
Heh heh! I wanted to know where that picture of string shapes came from. Clicking on the Google search link produces the first hit being this very page. LOL!
 

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