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<p>on the <a href="page.php?w=complex_plane">complex plane</a>, its equivalent in the <a href="page.php?w=split-complex_number">split-complex number</a>s, and the transpose operation in a matrix ring.</p>

<p>When R is a commutative ring and A is an <a href="page.php?w=algebra_over_a_ring">algebra over ''R''</a>, then an anti-involution &sigma; on A is a standard involution if it leaves R fixed in A and satisfies<br/>
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<p><big> Group theory </big></p>
<p>In <a href="page.php?w=group_theory">group theory</a>, an element of a <a href="page.php?w=group_%28mathematics%29">group</a></p><p>
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