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Differentiability for minimizers of anisotropic integrals

Paola Cavaliere, Anna D'Ottavio, Francesco Leonetti, Maria Longobardi (1998)

Commentationes Mathematicae Universitatis Carolinae

We consider a function u : Ω N , Ω n , minimizing the integral Ω ( | D 1 u | 2 + + | D n - 1 u | 2 + | D n u | p ) d x , 2 ( n + 1 ) / ( n + 3 ) p < 2 , where D i u = u / x i , or some more general functional with the same behaviour; we prove the existence of second weak derivatives D ( D 1 u ) , , D ( D n - 1 u ) L 2 and D ( D n u ) L p .

Diffusion and cross-diffusion in pattern formation

Wei-Ming Ni (2004)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

We discuss the stability and instability properties of steady state solutions to single equations, shadow systems, as well as 2 × 2 systems. Our basic observation is that the more complicated the pattern are, the more unstable they tend to be.

Discontinuous elliptic problems in N without monotonicity assumptions

Silvia Cingolani, Monica Lazzo (2001)

Commentationes Mathematicae Universitatis Carolinae

We prove existence of a positive, radial solution for a semilinear elliptic problem with a discontinuous nonlinearity. We use an approximating argument which requires no monotonicity assumptions on the nonlinearity.

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