Title: Toeplitz Quantization and Convexity,
Abstract: Let $T^m_f $ be the Toeplitz quantization of a real $ C^{\infty}$ function
defined on the sphere $ \mathbb{CP}(1)$. $T^m_f $ is therefore a Hermitian
matrix with spectrum $\lambda^m= (\lambda_0^m,\ldots,\lambda_m^m)$. Schur's
theorem says that the diagonal of a Hermitian matrix $A$ that has the same
spectrum of $ T^m_f $ lies inside a finite dimensional convex set whose extreme
points are $\{( \lambda_{\sigma(0)}^m,\ldots,\lambda_{\sigma(m)}^m)\}$, where
$\sigma$ is any permutation of $(m+1)$ elements. In this paper, we prove that
these convex sets "converge" to a huge convex set in $L^2([0,1])$ whose extreme
points are $ f^*\circ \phi$, where $ f^*$ is the decreasing rearrangement of $
f$ and $ \phi $ ranges over the set of measure preserving transformations of
the unit interval $ [0,1]$.