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Reference.org
Bitensor
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<p>In <a href="/facts/Differential_geometry/c04XmyLu">differential geometry</a> and <a href="/facts/General_relativity/jVsoIg8X">general relativity</a>, a bitensor (or bi-tensor) is a <a href="/facts/Tensorial/cAC6F6rF">tensorial</a> object that depends on two points in a <a href="/facts/Manifold/rXPERJtu">manifold</a>, as opposed to ordinary <a href="/facts/Tensors/pNjFo5tV">tensors</a> which depend on a single point. Bitensors provide a framework for describing relationships between different points in <a href="/facts/Spacetime/uRIN1x4b">spacetime</a> and are used in the study of various phenomena in <a href="/facts/Curved_spacetime/93NBB86g">curved spacetime</a>. </p>