(from WT:PHYS) I would say no on both counts. Generally, categories should not be included in a See also section. While an argument can be made for including this article in the category, I think it is sufficiently different from the rest of that category that inclusion would clutter up the category without meaningfully improving usability. I am removing Category:Physics for the same reason.On the other hand, I do think that the WP:PHYS tag on this talkpage is appropriate. The categorization and WikiProject schema serve different purposes. The one is to aid our readers in finding relevant information, while the other is to help editors find each other and help improve and maintain articles of common interest. It is useful for the project to be listed here, as people interested in GR are in the best position to be able to answer any physics questions that arise here. -