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<p><big> Functions </big></p>
<p>Let K be the set <b>C</b> of all <a href="page.php?w=complex_number">complex number</a>s, and let V be the set C<sub><b>C</b></sub>(R) of all <a href="page.php?w=continuous_function">continuous function</a>s from the <a href="page.php?w=real_line">real line</a> <b>R</b> to the <a href="page.php?w=complex_plane">complex plane</a> <b>C</b>.Consider the vectors (functions) f and g defined by f(t)&nbsp;:= e<sup>it</sup> and g(t)&nbsp;:= e<sup>-it</sup>.(Here, e is the <a href="page.php?w=e_%28mathematical_constant%29">base of the natural logarithm</a>,</p><p>
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