Monday, 18 November 2013

real analysis - Does there exist a scalar function g(bfx) that satisfies g(bfx+,bff(bfx))=g(bfx)det(I+,bff(bfx))?

Given a vector valued function f:RnRn, what is a scalar function g:RnR 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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