Interpretation of (X,T) coordinates in Kruskal diagram

[Hill]

I can't find in the video the following of what you quoted in the OP from the book

Me too. That statement is still a mystery to me.

 

[Sagittarius A-Star]

Me too. That statement is still a mystery to me.

With a Google search, I found the cited point 4 in the preview of Google books (using Chrome browser):
https://books.google.de/books?id=Wx...ances with the stick of the observer.&f=false

It refers indeed to figure 5.

 

[Sagittarius A-Star]

I don't find the point 4 in the errata sheet:
https://www.lapasserelle.com/general_relativity/erratum.html

 

[Hill]

I don't find the point 4 in the errata sheet:
https://www.lapasserelle.com/general_relativity/erratum.html

The plot thickens.

 

[Hill]

It seems that Susskind uses the same capital letters X, T for both, the locally applied standard Minkowski diagram in your posting #12 and the Kruskal diagram in your posting #8, which includes the upper quadrant containing the singularity.

I think that this is just what he does.