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      <description>如何将函数自然地延拓到整个空间的同时，限制原函数及其弱导数的“大小”？</description>
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      <description>体会弱导数和强导数的微妙差异。</description>
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      <description>Sobolev空间，距离离我们熟悉的空间，到底有多远？</description>
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