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This is a an excellent introduction to the subject. The book really breaks into 3 distinct parts. The first 5 chapters are a rapid introduction to the basics, similar to what one would get from any indroductory text. They are most notable for actually going through the details on D_n, S_n cyclic groups... The second section (chapters 6-13) gives a more graduate level presentation of the material. Starting with a discussion of group algebras, moving onto inducted representations Artin's theorem (the existence of virtual characters) The third section is Brauer Theory.
The book is by Serre so it goes without saying it one of the best if not the best book on the market. His failure to deal with the additional complexities of the infinite group case (which he indicates in the title) is a small problem. He could have spent at least 1 chapter addressing how the results of the book could be extended. The index of notation is a fantastic asset for a subject where notation plays such a large role.
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Jean-Pierre Serre is a famous fellow: that is why I bought his book. I have as contrast a book by Willem Brouwer and one by Coexter which are clean concise and useful. If you can get the Coexter and Moser classic:Generators and Relations for Discrete Groups (Ergebnisse der Mathematik und ihrer Grenzgebiete. 2. Folge) ,also found under ISBN-10: 0387092129. Both versions are out of print.Representation Theory of Finite Groups has the virtue of being cheap and available and somewhat more readable than the Serre book. The Brouwer book of tables is a Rice university press book from the library without a ISBN and isn't listed at amazon. The French method of presenting Math goes back to the Nicolas Bourbaki books that were written by groups of people and are "formally correct", but just not how you want to teach math. Unless you already have a PH.D. in group theory, try something cheaper and easier to start. There are a lot of books on the theory of representations of groups, but none are very easy.