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arXiv 2005.00790math.AP
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具有线性-超线性混合增长条件的分裂型变分问题

Variational problems of splitting-type with mixed linear-superlinear growth conditions

Michael Bildhauer, Martin Fuchs

摘要:

研究了一类线性-超线性混合增长的分裂型变分问题。在二维情况下,最小化问题由\[ J [w] = \int_Ω \Big[f_1\big(\partial_1 w\big) + f_2\big(\partial_2 w\big)\Big] \,dx \to \min \] w.r.t.合适的比较函数类。这里假设$f_1$是线性增长的凸能量密度,假设$f_2$是超线性增长的,例如由$N$函数给出或由$N$函数从下面限定。这类问题位于著名的超线性增长的分裂型问题和线性增长的分裂型问题(最近在[1]中考虑)之间的一个动机是与塑性数学问题的联系(比较[2])。在这里,我们证明了适当的松弛方法的结果,包括逼近程序,对偶,解的存在性和唯一性以及一些新的更高的可积性结果。

英文摘要:

Variational problems of splitting-type with mixed linear-superlinear growth conditions are considered. In the twodimensional case the minimizing problem is given by \[ J [w] = \int_Ω \Big[f_1\big(\partial_1 w\big) + f_2\big(\partial_2 w\big)\Big] \,dx \to \min \] w.r.t. a suitable class of comparison functions. Here $f_1$ is supposed to be a convex energy density with linear growth, $f_2$ is supposed to be of superlinear growth, for instance to be given by a $N$-function or just bounded from below by a $N$-function. One motivation for this kind of problem located between the well known splitting-type problems of superlinear growth and the splitting-type problems with linear growth (recently considered in [1]) is the link to mathematical problems in plasticity (compare [2]). Here we prove results on the appropriate way of relaxation including approximation procedures, duality, existence and uniqueness of solutions as well as some new higher integrability results.

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