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Has anyone described `unfolding' as used in mathphysics (e.g. on-shell AND off-shell) as analogous to a resolution in algebra - higher derivatives are unfolded in terms of new variables?

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Hi Jim, do you have a reference where this term is used and applied? Is it a vague general procedure or is it reasonably well defined (for mathematical physics, that is)? –  David Roberts Jun 15 '12 at 22:45
    
I believe he is referring the the procedure by which you expand a higher-order differential equation as a first order equation in more variables, by introducing new variables like "$k$th derivative of $x$". –  S. Carnahan Jun 16 '12 at 10:56

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