"This is an introductory textbook on group theory which covers its fundamentals in great detail. ... What distinguishes the treatment of group theory from that usually given in algebra textbooks is the very detailed presentation. ... This charming volume has much to recommend itself." (Monatshefte fur Mathematik, 2015) "This is a text aimed at graduate students. Its 350 pages or so cover more than enough to teach a year-long course on 'general group theory' (meaning here both finite and infinite groups). Most standard topics are covered ... in a fresh manner, by insisting on lesser known aspects and by providing newer, more elegant proofs. An adequate collection of proposed exercises comes at the end of each chapter ... ." (Marian Deaconescu, Zentralblatt MATH, Vol. 1244, 2012)