- #1
jouvelot
- 53
- 2
Hello everyone,
I don't get how the second-order derivative ##\partial^2 S/\partial x_i \partial x_j## of the phase S arrives here. If one performs a power series expansion of the Hamiltonian around ##\nabla S##, then I do get where the first term ##A## comes from, but then adding higher-order derivatives doesn't seem to introduce this second-order derivative of the phase S (even taking the somewhat
fuzzy footnote into account).
Does anyone who has read this book have an idea?
Thanks in advance.
Pierre
I don't get how the second-order derivative ##\partial^2 S/\partial x_i \partial x_j## of the phase S arrives here. If one performs a power series expansion of the Hamiltonian around ##\nabla S##, then I do get where the first term ##A## comes from, but then adding higher-order derivatives doesn't seem to introduce this second-order derivative of the phase S (even taking the somewhat
fuzzy footnote into account).
Does anyone who has read this book have an idea?
Thanks in advance.
Pierre