期刊
ANNALS OF MATHEMATICS
卷 174, 期 3, 页码 1485-1569出版社
Princeton Univ, Dept Mathematics
DOI: 10.4007/annals.2011.174.3.3
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资金
- Fondecyt [1110181, 1090103]
- Fondo Basal CMM, Chile
- RGC of Hong Kong
- CUHK
A celebrated conjecture due to De Giorgi states that any bounded solution of the equation Delta u + (1 - u(2))u = 0 in R-N with partial derivative(yN)u > 0 must be such that its level sets {u = lambda} are all hyperplanes, at least for dimension N <= 8. A counterexample for N >= 9 has long been believed to exist. Starting from a minimal graph F which is not a hyperplane, found by Bombieri, De Giorgi and Giusti in R-N, N >= 9, we prove that for any small alpha > 0 there is a bounded solution u(alpha)(y) with partial derivative(yN)u(alpha) > 0, which resembles tanh (t/root 2), where t = t(y) denotes a choice of signed distance to the blown-up minimal graph Gamma alpha := alpha(-1)Gamma. This solution is a counterexample to De Giorgi's conjecture for N >= 9.
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