  It is well-known that the mean curvature flow is a formal gradient flow of
the perimeter functional. However, by the work of Michor and Mumford [7,8], the
formal Riemannian structure that is compatible with the gradient flow structure
induces a degenerate metric on the space of hypersurfaces. It is then natural
to ask whether there is a nondegenerate metric space of hypersurfaces, on which
the mean curvature flow admits a gradient flow structure. In this paper we
study the mean curvature flow on two nondegenerate metric spaces of simple
closed plane curves: the uniformness-preserving metric structure proposed by
Shi and Vorotnikov [11] and the curvature-weighted structure proposed by Michor
and Mumford [8], and prove that the mean curvature flow is not a gradient flow
in either of the spaces.
