66718
This is a generalization of the Heine–Borel theorem , which states that any closed and bounded subspace of " R " is compact and therefore complete .
 Heine–Borel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Heine–Borel