What is the physical meaning of complex jacobian?

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The Jacobian matrix means about the physical deformation due to change of coordinates. But the Jacobian matrix with complex values may be implies that the space is complex, but the physical deformation is going to be real. So, how can a real space have a complex deformation? If the complex deformation values are plausible, then what would be the physical meaning of these values?

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The Jacobian is the derminant of the partial derivatives. It can't be complex if the functions and coordinates are all real.