The non-transverse monotone conjecture for Grassmannian Schubert problems

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Let α={α1<⋯<αk}\alpha=\{\alpha_1<\dotsb<\alpha_k\} with αk<n\alpha_k<n, and let (w1,…,wm)(w_1,\dotsc,w_m) be a Grassmannian Schubert problem for Fℓ(α;n)\mathbb{F}\ell(\alpha;n). Let t1,…,tm∈RP1t_1,\dotsc,t_m\in\mathbb{R}\mathbb{P}^1 be monotone with respect to the problem, meaning that the unique descents of the Grassmannian permutations vary monotonically along an orientation of RP1\mathbb{R}\mathbb{P}^1. Non-transverse monotone conjecture. The intersection

Xw1(t1)∩Xw2(t2)∩⋯∩Xwm(tm)X_{w_1}(t_1)\cap X_{w_2}(t_2)\cap\dotsb\cap X_{w_m}(t_m)

is transverse. The source explains that this conjecture implies the stronger reality conjecture, is supported by extensive computation, and remains open.

References

Primary source

James Ruffo, Yuval Sivan, Evgenia Soprunova and Frank Sottile, “Experimentation and conjectures in the real Schubert calculus for flag manifolds”, arXiv:math/0507377 (2005).

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