I read a lot of textbooks on pdf and it’s a very poor substitute. Jumping back and forth, as you do, between definitions, theorems, appendices is a nightmare wi

I read a lot of textbooks on pdf and it’s a very poor substitute. Jumping back and forth, as you do, between definitions, theorems, appendices is a nightmare with the pdf readers I’ve found. I have to reaort to making screenshots of things I’m likely to need to refer to again. Perhaps a good solution exists? It wouldn’t be hard to make.