What in the world are you talking about? Griffiths is substantially worse than shankar.
Griffiths doesn'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't already taken abstract algebra.
In what way is Shankar less rigorous than Griffiths?
Griffiths doesn'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't already taken abstract algebra.
In what way is Shankar less rigorous than Griffiths?