Kenig, Carlos E.; Ponce, Gustavo; Vega, Luis A bilinear estimate with applications to the KdV equation. (English) Zbl 0848.35114 J. Am. Math. Soc. 9, No. 2, 573-603 (1996). The authors start the work with a wide panoramic view of the results related to the initial value problem for the Korteweg-de Vries equation. The main result of the paper is to have found the lower best index \(s\), such that we have local well posedness in \(H^s(\mathbb{R})\): Existence, uniqueness, persistence and continuous dependence on the data, for a finite time interval, whose size depends on \(|u_0|_{H^s}\). The value \(s> -3/4\), is the optimal one provided by the used method. The result improves a previous one of the same authors. The method combines oscillatory integral estimates with bilinear estimates for \(\partial_x(u^2/2)\) in the Bourgain function spaces associated with the index \(s\). The estimates extend to the periodic case. Reviewer: L.Vazquez (Madrid) Cited in 11 ReviewsCited in 367 Documents MSC: 35Q53 KdV equations (Korteweg-de Vries equations) 35G25 Initial value problems for nonlinear higher-order PDEs 35D99 Generalized solutions to partial differential equations Keywords:Schrödinger equation; initial value problem; well-posedness PDF BibTeX XML Cite \textit{C. E. Kenig} et al., J. Am. Math. Soc. 9, No. 2, 573--603 (1996; Zbl 0848.35114) Full Text: DOI References: [1] B. Birnir, C. E. Kenig, G. Ponce, N. Svanstedt and L. Vega, On the ill-posedness of the IVP for the generalized Korteweg-de Vries and nonlinear Schrödinger equations, to appear J. London Math. Soc.. · Zbl 0855.35112 [2] Jerry Bona and Ridgway Scott, Solutions of the Korteweg-de Vries equation in fractional order Sobolev spaces, Duke Math. J. 43 (1976), no. 1, 87 – 99. · Zbl 0335.35032 [3] J. L. Bona and R. Smith, The initial-value problem for the Korteweg-de Vries equation, Philos. Trans. Roy. Soc. London Ser. 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