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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeJan 26th 2019

slightly expanded the section Duality with M-theory, mentioning more of the MO-planes and giving more pointers

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeJan 26th 2019

added more references on the correspondence MO5/O4 under M/II-duality, and added a graphics

• CommentRowNumber3.
• CommentAuthorUrs
• CommentTimeFeb 4th 2019

added some more details (here) on how the O$p$-plane charge of $- 2^{p-4}$ comes about via T-duality

• CommentRowNumber4.
• CommentAuthorUrs
• CommentTimeMay 14th 2019

added brief pointer to modified O-plane charges in the presence of discrete torsion (here)

• CommentRowNumber5.
• CommentAuthorUrs
• CommentTimeMay 15th 2019

in the section on O-plane charges I made explicit that the previous absolute numbers there must be understood in units of the corresponding D-brane charge $q_{Dp}$, so that the second table of charges is indeed consistent with the first, using $q_{Dp} = 1/2$ (as befits the orientifolding).

• CommentRowNumber6.
• CommentAuthorUrs
• CommentTimeAug 28th 2019

expanded a little the remark (here) on counting of D-branes in orientifolds