Eh, is this supposed to be a good book because I have no idea why the definitions aren't clearly marked and indexed. I only checked the chapter about Group Theo

Eh, is this supposed to be a good book because I have no idea why the definitions aren't clearly marked and indexed. I only checked the chapter about Group Theory but I was not impressed. Maybe for a quick review of the topic it might be enough but for a beginner it seems that it is not rigorous. The definitions could be much more clear explicit. And there is no reason why they should not be indexed.