The polynomial zero-avoidance conjecture on the unit ball

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Let P1,…,PN∈R[x1,…,xd]P_1,\ldots, P_N\in \mathbb R[x_1, \ldots, x_d] be polynomials, and let δ1,…,δN>0\delta_1,\ldots, \delta_N>0 satisfy

∑k=1Nδkdeg⁡Pk≤1.\sum_{k=1}^N \delta_k\deg P_k\leq 1.

Polynomial zero-avoidance conjecture. There exists a point p∈Bd⊂Rdp\in B^d\subset\mathbb R^d such that, for every k=1,…,Nk=1,\ldots,N, the point pp is at distance at least δk\delta_k from the zero set of PkP_k.

This conjecture simultaneously generalizes Bang's theorem and zero-avoidance results for polynomials. The supplied text gives partial results and a complex projective analogue, but does not state that the real-ball conjecture has been resolved.

References

Primary source

Alexey Glazyrin, Roman Karasev and Alexandr Polyanskii, “Covering by planks and avoiding zeros of polynomials”, arXiv:2112.05382 (2022).

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