Zilber's free-and-rotund exponential-algebraic closedness conjecture

Let VCn×(C×)nV\subseteq\mathbb{C}^n\times(\mathbb{C}^{\times})^n be an algebraic variety, and let π1\pi_1 and π2\pi_2 be the projections to the additive and multiplicative factors. Call VV free if π1(V)\pi_1(V) is not contained in a translate of a Q\mathbb{Q}-linear subspace and π2(V)\pi_2(V) is not contained in a translate of an algebraic subgroup. Let LCnL\leq\mathbb{C}^n be a Q\mathbb{Q}-linear subspace, let exp(L)\operatorname{exp}(L) be its coordinatewise exponential image, and let

πL:Cn×(C×)nCn/L×(C×)n/exp(L)\pi_L:\mathbb{C}^n\times(\mathbb{C}^{\times})^n\twoheadrightarrow \mathbb{C}^n/L\times(\mathbb{C}^{\times})^n/\operatorname{exp}(L)

be the quotient map. Call VV rotund if dim(πL(V))ndimL\dim(\pi_L(V))\geq n-\dim L for every such LL. Zilber's free-and-rotund exponential-algebraic closedness conjecture. If VV is free and rotund, then

VΓexp,V\cap\Gamma_{\operatorname{exp}}\neq\varnothing,

where Γexp\Gamma_{\operatorname{exp}} is the graph of the nn-fold coordinatewise exponential map. This is the precise special form studied in the paper; the paper proves a case of the broader exponential-algebraic closedness problem, while this conjectural statement remains open.

Sources & referencesView supporting material

Primary source

Francesco Gallinaro, “Exponential Sums Equations and Tropical Geometry”, arXiv:2203.13767 (2023).

Additional references

2 papers in this index state this conjecture (2021–2022). The statement above is taken from the most recent of them; the others are arXiv:2105.12679.

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