Equality conjecture for local Petrovskii lacuna counts

Let f0:RN2Rf_0:{\mathbb R}^{N-2}\to{\mathbb R} be a parabolic critical point, and consider a versal deformation of f0f_0. Table 1 gives, for each singularity and parity case, either an exact number of holomorphic local lacunas or an upper or lower bound for their number.

Equality conjecture. In every cell of Table 1, except possibly the cell corresponding to X92X_9^2, each inequality can be replaced by an equality.

The theorem preceding this conjecture establishes the listed exact values and bounds, with some bounds having only computer proofs. The conjecture concerns whether the remaining inequalities are sharp; the source gives no resolution status.

Sources & referencesView supporting material

Primary source

Victor A. Vassiliev, “Local Petrovskii lacunas at parabolic singular points of wavefronts of strictly hyperbolic PDE's”, arXiv:1607.04042 (2016).

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