Reality Property of Discrete Wronski Map with Imaginary Step
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For a set of quasi-exponentials with real exponents, we consider the discrete Wronskian (also known as Casorati determinant) with pure imaginary step 2h. We prove that if the coefficients of the discrete Wronskian are real and the imaginary parts of its roots are bounded by |h|, then the complex span of this set of quasi-exponentials has a basis consisting of quasi-exponentials with real coefficients. This result is a generalization of the statement of the B. and M. Shapiro conjecture on spaces of polynomials. The proof is based on the Bethe ansatz for the XXX model.
Mathematics Subject Classification (2010)14P99 17B37 82B23
Keywordsdiscrete Wronski map B. and M. Shapiro conjecture Bethe ansatz XXX model
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