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		<id>https://en.formulasearchengine.com/index.php?title=Frame_fields_in_general_relativity&amp;diff=242071</id>
		<title>Frame fields in general relativity</title>
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		<summary type="html">&lt;p&gt;2001:620:400:9:21A:64FF:FE9D:D730: /* Relationship with metric tensor, in a coordinate basis */&lt;/p&gt;
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