Yu's conjecture on the degree of the Jacobian bracket

Let k[x1,,xn]k[x_1,\ldots,x_n] be a polynomial ring, and let ff and gg be algebraically independent polynomials whose homogeneous components of maximal degree are algebraically dependent. Suppose that ff and gg generate their respective integral closures C(f)C(f) and C(g)C(g) in k[x1,,xn]k[x_1,\ldots,x_n], and that neither degf\deg f divides degg\deg g nor degg\deg g divides degf\deg f. Yu's conjecture. Then

deg[f,g]>min{deg(f),deg(g)}.\deg[f,g]>\min\{\deg(f),\deg(g)\}.

This conjecture gives a proposed lower bound for the degree of the bracket under algebraic dependence of the leading homogeneous components and the stated integral-closure hypotheses. The source invokes it in connection with determining multidegrees of tame polynomial automorphisms, but does not provide evidence of a resolution.

Sources & referencesView supporting material

Primary source

Jiantao Li and Xiankun Du, “Tame automorphisms with multidegrees in the form of arithmetic progressions”, arXiv:1112.6071 (2011).

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