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In [[mathematics]], a '''coframe''' or '''coframe field''' on a [[smooth manifold]] <math>M</math> is a system of [[one-form]]s or [[covector]]s which form a [[vector space|basis]] of the [[cotangent bundle]] at every point. In the exterior algebra of <math>M</math>, one has a natural map from <math>v_k:\bigoplus^kT^*M\to\bigwedge^kT^*M</math>, given by <math>v_k:(\rho_1,\ldots,\rho_k)\mapsto \rho_1\wedge\ldots\wedge\rho_k</math>. If <math>M</math> is <math>n</math> dimensional a coframe is given by a section <math>\sigma</math> of <math>\bigoplus^nT^*M</math> such that <math>v_n\circ\sigma\neq 0</math>. The inverse image under <math>v_n</math> of the complement of the zero section of <math>\bigwedge^nT^*M</math> forms a <math>GL(n)</math> [[principal bundle]] over <math>M</math>, which is called the [[frame bundle|coframe bundle]].
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== See also ==
 
* [[Frame fields in general relativity]]
* [[Moving frame]]
 
[[Category:Differential geometry]]
 
 
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Latest revision as of 00:25, 24 August 2014

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