DUALITY BETWEEN THE GENERALIZED CAUSTIC AND MAXWELL STRATUM FOR THE SINGULARITIES B-2K AND C-2K

This Note deals with a generalization of the symmetry between the caus tic and the Maxwell stratum of the singularity B-4. Two symplectic str uctures are defined on the versal unfolding of B-2k. It is proved that couples of Lagrangian strata of the discriminant defined in each stru cture are symplectomorphic. A similar symmetry holds for C-2k.