336804
In the same way as a complex number can be represented in a polar form , one has a polar decomposition for a complex measure : There exists a measurable function θ with real values such that meaning for any absolutely integrable measurable function f , i.e. , f satisfying One can use the Radon – Nikodym theorem to prove that the variation is a measure and the existence of the polar decomposition .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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