Susskind: "it can be shown".

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In summary, Leonard Susskind discusses anomaly cancellation in his talk, which can be found in various string theory books such as Zweibach's book. In gsw, it is discussed in sections 3.1 and 2.3, while Zweibach's second edition goes into detail in section 12.5. One way to understand anomaly cancellation is by using the lightcone gauge to analyze the EOM, after which the Lorentz algebra must be reviewed to ensure Lorentz covariance. Alternatively, choosing three spacetime dimensions can also avoid this anomaly.
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MathematicalPhysicist
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Where can I read the technical issue Leonard Susskind is talking in the next talk in 3:36?

Is it discussed in Zweibach's book?

 
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In every string theory book. In gsw it is in section 3.1 and 2.3. Zwiebachs second edition treats it in detail in 12.5.
 
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Btw, he is talking about anomaly cancellation. One way to see it is when you use the lightcone gauge to analyse the EOM. After that you have to review the Lorentz algebra, because your treatment is not Lorentz-covariant explicitly. The Lorentz algebra is retained iff you impose certain conditions on the normal ordering constant and the spacetime dimension.

Note that choosing three spacetime dimensions also circumvents this anomaly.
 

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When something can be shown in science, it means that there is empirical evidence or logical reasoning to support a theory or hypothesis. It is a way of providing proof and validating scientific claims.

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