Algebraic diffeomorphism transitivity conjecture for rational surfaces

Let XX be a smooth projective rational surface, and let nn be a natural integer. The group of algebraic diffeomorphisms Diffalg(X(R))\operatorname{Diff}_{\mathrm{alg}}(X(\mathbb{R})) consists of algebraic diffeomorphisms of the real locus X(R)X(\mathbb{R}). Algebraic diffeomorphism transitivity conjecture. The group Diffalg(X(R))\operatorname{Diff}_{\mathrm{alg}}(X(\mathbb{R})) acts nn-transitively on X(R)X(\mathbb{R}). The only evidence given is the case X=P1×P1X=\mathbb{P}^1\times\mathbb{P}^1, established by the preceding theorem; the conjecture is intended to provide the transitivity needed to compare rational models of nonorientable surfaces, and its general case remains open.

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Primary source

Indranil Biswas and Johannes Huisman, “Rational real algebraic models of topological surfaces”, arXiv:math/0701402 (2007).

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