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This can be summarized by saying that the inverse curl of a three-dimensional vector field can be obtained up to an integration constant and an unknown irrotational field with the Biot–Savart law .
 Biot–Savart
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Biot–Savart