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Kolmogorov also showed , in 1933 , that if the variables are independent and identically distributed , then for the average to converge almost surely on " something " ( this can be considered another statement of the strong law ) , it is necessary that they have an expected value ( and then of course the average will converge almost surely on that ) .
 person: Kolmogorov
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Kolmogorov