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This paper is the first part of a two part paper which introduces the studyof the Whitney Equisingularity of families of Symmetric determinantalsingularities. This study reveals how to use the multiplicity of polar curvesassociated to a generic deformation of a singularity to control the Whitneyequisingularity type of these curves.

Symmetric Determinantal Singularities I: The Multiplicity of the Polar Curve