Lower semicontinuity via W^{1,q}-quasiconvexity

We isolate a general condition, that we call "localization principle", on the integrand L:\MM\to[0,\infty], assumed to be continuous, under which W^{1,q}-quasiconvexity with q\in[1,\infty] is a sufficient condition for I(u)=\int_ΩL(\nabla u(x))dx to be sequentially weakly lower semicontinuous on W^{1,p}(Ω;\RR^m) with p\in]1,\infty[. Some applications are given.

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