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Partial differential equations (PDEs): Existence and uniqueness, regularity, boundary conditions, linear and non-linear operators, stability, soliton theory, integrable PDEs, conservation laws, qualitative dynamics.

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Nash–Moser–De Giorgi differences

The names of Nash, Moser and De Giorgi are associated to elliptic and parabolic regularity theory. But what are the differences in the approach between the three contributions? Can you briefly sketch …
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