A polar-factor retraction on the symplectic Stiefel manifold is introduced with a closed-form inverse, claimed to be only the second such retraction after the Cayley version.
Symplectic analogs of polar decomposition and their applications to bosonic gaussian channels
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A polar-factor retraction on the symplectic Stiefel manifold with closed-form inverse
A polar-factor retraction on the symplectic Stiefel manifold is introduced with a closed-form inverse, claimed to be only the second such retraction after the Cayley version.