CorewiseGeometry.retract
========================

.. py:method:: t3toolbox.manifold.CorewiseGeometry.retract(p)

   .. code-block:: python

      def retract(
              self,
              p:  T3Tangent,  # step (a corewise tangent at frame = (U, G, G, G))
      ) -> t3.TuckerTensorTrain:  # additive retraction: cores += p


   Additive retraction: add the variation cores to the point's cores (``cores += p``).

   Recovers the point ``(U, G)`` from ``p.frame`` (which :py:meth:`frame` built as ``(U, G, G, G)``)
   and adds the variations. ``p`` must be a corewise tangent (a frame from :py:meth:`frame`).