57006
Originally conjectured by Henri Poincaré , the theorem concerns a space that locally looks like ordinary three-dimensional space but is connected , finite in size , and lacks any boundary ( a closed 3-manifold ) .
 Henri Poincaré
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Henri Poincaré