I want to study quantum mechanics for undergrad level, and found out really lots of people recommends "Introduction to Quantum Mechanics by David J.Griffiths" which is Alright, so I visited my school book store for this cat-pictured book. and found this puzzle-pictured book. Same name same author. but not the cat one. Are these are same books? I am not in English-using country. Is it merely just a international edition?