科研之友
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摘要
In this paper, we prove that if X is an infinite-dimensional real Hilbert space and J : X -> R is a sequentially weakly lower semicontinuous C-1 functional whose Gateaux derivative is non-expansive, then there exists a closed ball B in X such that (id + J') (B) intersects every convex and dense subset of X.
- 出版日期2014-1
