Generating-function conjecture for Thom polynomials of nilpotent algebras

Let QQ be a [?][?]-dimensional, commutative, nilpotent algebra with deg(tpQ(l))=μl+γ\deg(\operatorname{tp}_Q(l))=\mu\cdot l+\gamma. Write

Dj=i=0cizji,disμ=i=1μj=i+1μ(zizj),D_j=\sum_{i=0}^{\infty}\frac{c_i}{z_j^i},\qquad \operatorname{dis}_\mu=\prod_{i=1}^{\mu}\prod_{j=i+1}^{\mu}(z_i-z_j),

and let RES\operatorname{RES} denote the iterated residue in the variables z1,,zμz_1,\ldots,z_\mu. Generating-function conjecture. (a) There exists a rational function kQk_Q in z1,,zμz_1,\ldots,z_\mu, of degree γ(μ+12)\gamma-\binom{\mu+1}{2}, such that

tpQ(l)=RES(kQdisμi=1μzilDi).\operatorname{tp}_Q(l)=\operatorname{RES}\left(k_Q\cdot\operatorname{dis}_\mu\cdot\prod_{i=1}^{\mu}z_i^lD_i\right).

(b) The generating function has the form

kQ(z1,,zμ)=h(z1,,zμ)aA(zia+zjazsa),k_Q(z_1,\ldots,z_\mu)=\frac{h(z_1,\ldots,z_\mu)}{\prod_{a\in A}(z_{i_a}+z_{j_a}-z_{s_a})},

where hh is a polynomial and {ia,ja,sa}aA\{i_a,j_a,s_a\}_{a\in A} is a repetition-free list of indices satisfying iaja<sai_a\leq j_a<s_a for every aAa\in A. This extends the generating-function theorem of Berczi and Szenes for Morin singularities; the source reports that the conjecture was expected to be proved in work in progress by M. Kazarian.

Sources & referencesView supporting material

Primary source

L. M. Fehér and R. Rimányi, “Thom series of contact singularities”, arXiv:0809.2925 (2010).

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