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<p>can be considered extensions of  spaces.</p>

<p>Hardy spaces have a number of applications, both in <a href="page.php?w=mathematical_analysis">mathematical analysis</a> itself as well as in interdisciplinary areas such as <a href="page.php?w=control_theory">control theory</a> (e.g. <a href="page.php?w=H_infinity"><math>H^{\infty}</math> methods</a>) and <a href="page.php?w=scattering_theory">scattering theory</a>.</p>

<p><big> Definition </big></p>
<p><big>On the unit disk</big></p>
<p>The Hardy space  for  is the class of <a href="page.php?w=holomorphic_functions">holomorphic functions</a></p><p>
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