The non-transverse monotone conjecture for Grassmannian Schubert problems

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 F(α;n)\mathbb{F}\ell(\alpha;n). Let t1,,tmRP1t_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.

Sources & referencesView supporting material

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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