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For example , Georg Cantor ( who introduced this concept ) demonstrated that the real numbers cannot be put into one-to-one correspondence with the natural numbers ( non-negative integers ) , and therefore that the set of real numbers has a greater cardinality than the set of natural numbers .
 Georg Cantor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Georg Cantor