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(PS)-weak lower semicontinuity in one dimension: A necessary and sufficient condition

机译:一维(PS)弱的下半连续性:一个充要条件

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摘要

In this paper, we give a necessary and sufficient condition for a one-dimensional functional 1 (u) = integral(1)(0) f (u (t)) dt to satisfy the so-called (PS)-weak lower semicontinuity property on the space W-1,W-p((0, 1); R-m); that is, I(u) <= lim inf(k ->infinity) I(u(k)) for all u(k) -> u in W-1,W-p((0, 1); R-m) and I'(u(k)) -> 0 in W-1, p/p-1 ((0, 1); R-m). The result shows that in this case the property of (PS)-weak lower semicontinuity is in general not equivalent to convexity of the functional if m >= 2. (c) 2005 Elsevier Ltd. All rights reserved.
机译:在本文中,我们为一维泛函1(u)=积分(1)(0)f(u(t))dt给出了满足所谓的(PS)-弱下半连续性的充要条件W-1,Wp((0,1); Rm);也就是说,对于W-1,Wp((0,1); Rm)和I中的所有u(k)-> u,I(u)<= lim inf(k-> infinity)I(u(k)) '(u(k))-> W-1中的0,p / p-1((0,1); Rm)。结果表明,在这种情况下,如果m> = 2,则(PS)弱下半连续性的属性通常不等于泛函的凸性。(c)2005 Elsevier Ltd.保留所有权利。

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