Question

Is this correct?

Answer 1

\[\int\limits_{}^{}da=\int\limits_{}^{}x db\]

can you convert this into:
\[\int\limits_{}^{}(da/db) db=\int\limits_{}^{}x db\]
so x= da/db?

Answer 2

yes you can
but google it once
im not sure

Answer 3

Yes, I thought it might, as it's basically reversing one of the processes in integration by substitution. Anyone else have an idea?

Answer 4

im pretty sure u can

Answer 5

I think it is okay in some situations, but since I don't know what these variables represent, I'm not sure
There are certainly criteria these functions have to meet in order fort this to be valid.
As to what those criteria are, you may need to ask a real expert.
It seems to me like you're trying to use a special case of the Leibniz integral rule, which I know only works in limited situations
Here's the wiki on that for perspective
http://en.wikipedia.org/wiki/Leibniz_integral_rule

Answer 6

a=(Least) action
b=time

Answer 7

lagrangian?

Answer 8

\[(LeastAction)=\int\limits_{}^{} (Lagrangian)dt\]
\[\int\limits_{}^{} d(LeastAction)=\int\limits_{}^{} (Lagrangian)dt\]
\[\int\limits_{}^{} (d(LeastAction)/dt) dt=\int\limits_{}^{} (Lagrangian)dt\]