I used to have a set theory textbook downloaded free from the internet. I lost my laptop in the airport of a city in Eastern Europe, and it was not found (or perhaps “not found”) by the airport security. I now try to rediscover the file. I remember the author was a female mathematician from Berkeley. From an internet search I believe that it might have been Julia Robinson, but I still can’t find the book.
It had a fair number of exercises and I believe it covered Gödel’s incompleteness theorem. I would be grateful for help to find the book.
There is the book "Introduction to Modern Set Theory" located here by Judith Roitman. Might that be the book you're thinking of?