The Schubert-calculus form of the rational total reality conjecture

From papers

Let 0d<n0\le d<n, let t1<t2<<t(n+1)(dn)t_1<t_2<\dots<t_{(n+1)(d-n)} be real numbers, and let r:CCd+1\mathbf r:\mathbb C\to\mathbb C^{d+1} be a rational normal curve with coordinates ri(t)=tir_i(t)=t^i for i=0,,di=0,\dots,d. For each ii, let TiT_i be the osculating (dn)(d-n)-dimensional plane to r\mathbf r at t=tit=t_i. Schubert-calculus interpretation. Any (n+1)(n+1)-dimensional subspace of Cd+1\mathbb C^{d+1} that meets all (n+1)(dn)(n+1)(d-n) subspaces TiT_i nontrivially is real. The source states this as equivalent to the rational total reality conjecture, but provides no resolution status.

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Sources & referencesView supporting material

Primary source

A. Degtyarev, T. Ekedahl, I. Itenberg, B. Shapiro and M. Shapiro, “On total reality of meromorphic functions”, arXiv:math/0605077 (2006).

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