Conjecture on zeroes of functions in the evaluation space

Let VV be the function space under consideration, and let B\mathcal{B} be the evaluation set. Let ll, qq, kk, and ii be the parameters used in the construction, and let the code's lower bound for the distance be the one given in Theorem.

Zero-count conjecture. Any function fVf\in V will have fewer than

lqk+(k1)(q1)qk1+(q2)qk1lq^{k}+(k-1)(q-1)q^{k-1}+(q-2)q^{k-1}

zeroes in B\mathcal{B}, and therefore the lower bound for the distance in Theorem will not be attained for i3i\geq 3.

This conjecture predicts that the previously obtained distance lower bound is not sharp in the stated range, by ruling out functions attaining the corresponding maximum number of zeroes on the evaluation set. Its status is not resolved in the supplied text.

Sources & referencesView supporting material

Primary source

M. Chara, F. Galluccio and E. Martínez-Moro, “Locally recoverable codes from towers of function fields”, arXiv:2209.07136 (2022).

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