many thanks to Prof. M and Prof. S for sharing it. of course, many congrats and thanks to ictp and the ictp lectrurer
https://www.ictp-saifr.org/ads-cft2023/
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take note: difference between spacetime indices and gauge indices
picking up the pieces from my old exercise notes then going to DS and ADS space
in this second part of the lecture some review discussions on kruskal diagram, carter-penrose diagram, cp diagram of collapsing star forming into a blackhole
https://youtu.be/4gWt3v0Wac0?list=PLg0_ydgtbHGH0FIZzD97RVU8K0DA9vI-Q