What in the world are you talking about? Griffiths is substantially worse than shankar.<p>Griffiths doesn&#x27;t even get into Hilbert spaces until chapter three, at which point he delivers a broken and incomprehensible explanation. He attempts to teach Hilbert operators by analogy to the multiplication or application by adjacency people use in normal arithmetic. This is a terrible approach, and confuses the hell out of students who haven&#x27;t already taken abstract algebra.<p>In what way is Shankar less rigorous than Griffiths?