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In algebraic group theory , approximation theorems are an extension of the Chinese remainder theorem to algebraic group s G over global field s k. They give conditions for the group G ( k ) to be dense in a restricted direct product of groups of the form G ( ks ) for ks a completion of k at the place s. In weak approximation theorems the product is over a finite set of places s , while in strong approximation theorems the product is over all but a finite set of places .
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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} 
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