The extended fixed-point index conjecture for polynomial maps

Let ff be a polynomial map of degree dd, and let Fix(f)\mathrm{Fix}(f) be its set of fixed points, considered without multiplicity in this conjecture. For ζFix(f)\zeta\in\mathrm{Fix}(f), define the fixed-point multiplicity m(f,ζ)m(f,\zeta) and the holomorphic index

ι(f,ζ):=12π1zζ=ϵdzzf(z).\iota(f,\zeta):=\frac{1}{2\pi\sqrt{-1}}\oint_{|z-\zeta|=\epsilon}\frac{dz}{z-f(z)}.

The index is invariant under biholomorphic transformations, equals 1/(1f(ζ))1/(1-f'(\zeta)) at a simple fixed point, and satisfies

ζFix(f)m(f,ζ)=degf,ζFix(f)ι(f,ζ)=0.\sum_{\zeta\in\mathrm{Fix}(f)}m(f,\zeta)=\deg f,\qquad \sum_{\zeta\in\mathrm{Fix}(f)}\iota(f,\zeta)=0.

Let P~d\widetilde{P}_d be the parameter space of such maps and let Φ~d\widetilde{\Phi}_d send ff to the collection ([ι(f,ζ),m(f,ζ)])ζFix(f)\bigl([\iota(f,\zeta),m(f,\zeta)]\bigr)_{\zeta\in\mathrm{Fix}(f)}.

Extended fixed-point index conjecture. The map Φ~d\widetilde{\Phi}_d is finite, and the analogous results to the main theorems hold for Φ~d\widetilde{\Phi}_d for every parameter value, without exception.

This conjecture extends the multiplier-data construction to parameter values outside the generic space VdV_d, including maps with multiple fixed points. The supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Toshi Sugiyama, “The Moduli Space of Polynomial Maps and Their Fixed-Point Multipliers”, arXiv:0708.2512 (2017).

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