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- W2078005243 abstract "We give examples of bounded inverses of polynomials in R, n > 1, which are not Fourier multipliers of Z/(R) for any p ¥=2. Our main tool is the Kakeya set construction of C. Fefferman. Using these results, we relate the invertibility on Lp of a linear second order constant coefficient differential opera- tor D on R to the geometric structure of quadratic surfaces associated to its symbol d. This work was motivated by multiplier conjectures of N. Riviere and R. Strichartz. 0. Introduction. Let D be a linear constant coefficient differential operator on R, with symbol d. We assume throughout this paper that D has order at most two, and we shall examine the Lp spectrum and invertibility of D. (See §1 for the precise definitions we use.) Our main tool in this analysis will be the Kakeya set construc- tion of Charles Fefferman, through which we shall relate invertibility of D to the geometric structure of quadratic surfaces associated to d. If D is elliptic and d has no real zeroes, D is Lp invertible for allp, 1 <p < oo. As we examine less trivial cases, great complexity seems to arise. The operator" @default.
- W2078005243 created "2016-06-24" @default.
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- W2078005243 date "1980-02-01" @default.
- W2078005243 modified "2023-09-24" @default.
- W2078005243 title "$Lsp{p}$ behavior of certain second order partial differential operators" @default.
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- W2078005243 doi "https://doi.org/10.1090/s0002-9947-1980-0586732-5" @default.
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