Within the [solid_sigma.py](https://github.com/bhosale2/PyAxisymFlow/blob/3f41fecc613987e1c6194fd5a424b577480de980/pyaxisymflow/elasto_kernels/solid_sigma.py) and [div_tau.py](https://github.com/bhosale2/PyAxisymFlow/blob/3f41fecc613987e1c6194fd5a424b577480de980/pyaxisymflow/elasto_kernels/div_tau.py), some extra terms pertinent to the axisymmetric cylinderical systems are absent. [Operations of the vector gradient of reference map and tensor divergence of the stress tensor](https://en.wikipedia.org/wiki/Del_in_cylindrical_and_spherical_coordinates) should be reviewed and rectified.
Within the solid_sigma.py and div_tau.py, some extra terms pertinent to the axisymmetric cylinderical systems are absent. Operations of the vector gradient of reference map and tensor divergence of the stress tensor should be reviewed and rectified.