The non-unit gradient degree conjecture for hypersurfaces with isolated singularities

Let fC[x0,,xn]f\in \mathbb{C}[x_0,\ldots,x_n] be a reduced homogeneous polynomial, and let V(f)V(f) be its associated projective hypersurface. Write d=deg(f)d=\operatorname{deg}(f) and let d(f)d(f) denote the degree of the gradient map of ff. Assume

d>2,n>2,d>2,\qquad n>2,

and that V(f)V(f) has only isolated singularities. Non-unit gradient degree conjecture. Then

d(f)1.d(f)\neq 1.

This conjecture concerns the degree of the gradient map for projective hypersurfaces with isolated singularities and asserts that, beyond the quadratic and low-dimensional cases, this degree cannot equal one. Its resolution status is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

Imran Ahmed, “Polar Cremona Transformations and Monodromy of Polynomials”, arXiv:0705.0709 (2007).

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