# Something between Lagrangian and Hamiltonian called Routhian

So, in my mechanics class, the teacher mentioned there is a special function which is kind of a midpoint between the Lagrangian and the Hamiltonian, called the Routhian. Now, I wanted to give it a look, but I can't find any trace of it in Google, and my mathematical physics teacher never heard of it (the reason I didn't ask my mechanics teacher being that he would probably give me an informal view, whereas I would like to see the mathematical formalism too). Has anyone ever heard of this function, and know where I find some reference of it?

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try googling for "routh's procedure" or wikipedia: en.wikipedia.org/wiki/Routhian –  luksen Nov 30 '13 at 18:29
I found an online description here: books.google.com/… –  Kevin Nov 30 '13 at 18:41
There's a nice review in the answer to this question –  Kyle Kanos Nov 30 '13 at 19:04