Recent content by rtransformation

Thank you

haha, Thank you, i just can't remember the correct word, thank you again isn't there exist a method to handle the uncertain z? that baffles me ...

I mean if i want to integral the dy=z*dx or something like this with an unknown z which may have some relation with the x, how can i do? Is there some area of mathematics concerning this kind of questions?

Homework Statement How can I deal with such an integral: the integrand include another variable which has some relationship with the variable of integration, but i do not know the exact relationship. Can I just see the "another variable" mentioned above as a invariant and put it outside from...

I found it in the Walter Greiner‘s famous classical mechanics book “Classical Mechanics——Systems of Particles and Hamiltonian Dynamics” ，Chapter 19——Canonical Transformation，and what I asked is the point transformation which is discussed in detail in this book.

Thank you, I now get it.

I just want to know how I can get this result through derivation.:frown:

actually, I didn't find the relation between the vector transformation and my question, could you please be more specific and help me solve this problem?Thank you very much. Is this transformation a contact transformation?

Thank you! I really need to study some basic knowledge now...Thank you again.

qi is the cartesian coordinate, and Qi is the Generalized coordinate, why the momentum under the two coordinates have this transformation way: pi=∑Pj(∂Qj/∂qj) pi and Pi are corresponding momentum under the two coordinate respectively.