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<p>and <a href="page.php?w=dual_number">dual number</a> plane each have points which are considered numbers themselves, and can be added and multiplied. A <a href="page.php?w=Riemann_surface">Riemann surface</a> or <a href="page.php?w=Lorentz_surface">Lorentz surface</a> appear locally like the complex plane or hyperbolic number plane, respectively.</p>

<p><big>Definition and meaning</big></p>
<p>Mathematical spaces are often defined or represented using numbers rather than <a href="page.php?w=foundations_of_geometry">geometric axioms</a>. One of the most</p><p>
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