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The Sylvester equation and integrable equations. I: The Korteweg-de Vries system and sine-Gordon equation. (English) Zbl 1420.35299

Summary: The paper is to reveal the direct links between the well known Sylvester equation in matrix theory and some integrable systems. Using the Sylvester equation \(KM + MK = r s^T\) we introduce a scalar function \(S^{(i, j)} = s^TK^j(I + M)^{-1}K^ir\) which is defined as same as in discrete case. \(S^{(i, j)}\) satisfy some recurrence relations which can be viewed as discrete equations and play indispensable roles in deriving continuous integrable equations. By imposing dispersion relations on \(r\) and \(s\), we find the Korteweg-de Vries equation, modified Korteweg-de Vries equation, Schwarzian Korteweg-de Vries equation and sine-Gordon equation can be expressed by some discrete equations of \(S^{(i, j)}\) defined on certain points. Some special matrices are used to solve the Sylvester equation and prove symmetry property \(S^{(i, j)} = S^{(j,i)}\). The solution \(M\) provides \(t\) function by \(t = \mid I + M\mid\). We hope our results can not only unify the Cauchy matrix approach in both continuous and discrete cases, but also bring more links for integrable systems and variety of areas where the Sylvester equation appears frequently.

MSC:

35Q51 Soliton equations
35Q53 KdV equations (Korteweg-de Vries equations)
37K40 Soliton theory, asymptotic behavior of solutions of infinite-dimensional Hamiltonian systems
39A99 Difference equations

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