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<p>characteristic , <a href="page.php?w=Yukiyosi_Kawada">Kawada</a> and <a href="page.php?w=Ichiro_Satake">Satake</a> used Witt duality to get a very easy description of the -part of the reciprocity homomorphism.</p>

<p>However, these very explicit theories could not be extended to more general number fields. General class field theory used different concepts and constructions which work over every global field.</p>

<p>The famous problems of <a href="page.php?w=David_Hilbert">David Hilbert</a> stimulated further development, which led to the <a href="page.php?w=reciprocity_law_%28mathematics%29">reciprocity laws</a>,</p><p>
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