Conjecture on the ordering of weights in determinantal codes

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Let ell≤mell \leq m be positive integers and let tt be an integer satisfying 1<t<ell1<t<ell. For the determinantal code, write hatwr(t;ell,m)hat{w}_r(t;ell,m) for the weight indexed by rr. Weight-ordering conjecture. The weights hatw1(t;ell,m),…,hatwell(t;ell,m)hat{w}_1(t;ell,m),\dots,hat{w}_{ell}(t;ell,m) are mutually distinct; they satisfy

hatw1(t;ell,m)<hatw2(t;ell,m)<⋯<hatwell−t+1(t;ell,m),hat{w}_1(t;ell,m)<hat{w}_2(t;ell,m)<\dots<hat{w}_{ell-t+1}(t;ell,m),

and, for every ell−t+2≤rleqellell-t+2\leq rleqell, the weight hatwr(t;ell,m)hat{w}_r(t;ell,m) lies between hatwr−2(t;ell,m)hat{w}_{r-2}(t;ell,m) and hatwr−1(t;ell,m)hat{w}_{r-1}(t;ell,m). This conjecture concerns the unresolved comparison of nonzero weights when 1<t<ell1<t<ell; the preceding special cases t=1t=1 and t=ellt=ell have simpler weight-ordering behavior.

References

Primary source

Peter Beelen and Sudhir R. Ghorpade, “Hyperplane Sections of Determinantal Varieties over Finite Fields and Linear Codes”, arXiv:1809.04690 (2018).

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