Pfaffian system

http://dbpedia.org/resource/Pfaffian_system

rdf:langString Pfaffian system
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<http://dbpedia.org/resource/Integrability_conditions_for_differential_systems>
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<http://en.wikipedia.org/wiki/Pfaffian_system?oldid=16758996&ns=0>
<http://en.wikipedia.org/wiki/Pfaffian_system>

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