Abstract
In this paper, the question of existence of a natural and projectively equivariant symbol calculus is analysed using the theory of projective Cartan connections. A close relationship is established between the existence of such a natural symbol calculus and the existence of an sl(m + 1, ℝ)-equivariant calculus over ℝm. Moreover, it is shown that the formulae that hold in the non-critical situations over Rm for the sl(m + 1,ℝ)-equivariant calculus can be directly generalized to an arbitrary manifold by simply replacing the partial derivatives by invariant differentiations with respect to a Cartan connection.
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