Given a vector valued function f:Rn→Rn, what is a scalar function g:Rn→R that satisfies the following g(x+f(x))=g(x)det(I+f′(x)), where f′(x) is the Jacobian matrix of f(x) and I is the n×n identity matrix.
If a solution can't be found for arbitrary f, what structure can one impose on f for there to exist a particular function g that satisfies the above condition.
One particular example of a function g that satisfies the above is all I'm after (i.e., I don't need the most general solution).
Alternatively: Can one prove that there does not exist a function g that satisfies the above?
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