Denis's strengthened Carlitz–Schanuel conjecture

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Let A=Fq[θ]A=\mathbb{F}_q[\theta], let K=Fq(θ)K=\mathbb{F}_q(\theta), and let pp be the characteristic of Fq\mathbb{F}_q. For AA-linearly independent elements u1,…,un∈C∞u_1,\ldots,u_n\in\mathbb{C}_\infty, consider the Carlitz exponential and its higher derivatives with respect to θ\theta, denoted by exp⁡C(i)\exp_C^{(i)}. Then

trdeg⁡KK(u1,…,un,exp⁡C(u1),…,exp⁡C(un),…,exp⁡C(p−1)(u1),…,exp⁡C(p−1)(un))≥pn.\operatorname{trdeg}_K K(u_1,\ldots,u_n,\exp_C(u_1),\ldots,\exp_C(u_n),\ldots,\exp_C^{(p-1)}(u_1),\ldots,\exp_C^{(p-1)}(u_n))\geq pn.

Denis's strengthened conjecture. The displayed transcendence-degree inequality holds.

The source describes this as a strengthening proposed by Denis to encompass algebraic-independence results involving derivatives in the parameter θ\theta. Its general status is left unresolved.

References

Primary source

F Pellarin, “On a variant of Schanuel conjecture for the Carlitz exponential”, arXiv:1610.04048 (2017).

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