Shapiro–Shapiro conjecture for maximally inflected rational curves

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Let d>rd>r be integers and let calpha1,…,αncalpha^1,\ldots,\alpha^n be ramification data for degree dd rational curves in Pr\mathbb{P}^r. Let s1,…,sns_1,\ldots,s_n be distinct points of RP1\mathbb{R}\mathbb{P}^1. Shapiro–Shapiro conjecture. Every degree-dd rational curve φ:P1→Pr\varphi:\mathbb{P}^1\rightarrow\mathbb{P}^r with ramification αi\alpha^i at sis_i for each i=1,…,ni=1,\ldots,n is real. The question of whether real ramification data always produce real curves is unknown in general; this conjecture would give a strong affirmative answer and is a formulation of the Shapiro–Shapiro conjecture in real Schubert calculus.

References

Primary source

Viatcheslav Kharlamov and Frank Sottile, “Maximally inflected real rational curves”, arXiv:math/0206268 (2003).

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