The infinitesimal operators corresponding to the vector fields
2.
Acting the infinitesimal operators on the wavefunction " N " times and taking the limit as " N " tends to infinity gives the finite operators.
3.
The unitary part of their polar decomposition is the operator corresponding to an element in the original real Lie group, while the positive part is the exponential of an imaginary multiple of the infinitesimal operator corresponding to an element in the maximal cone.
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