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He took lessons in algebra from Augustus De Morgan , with a view to reading Pierre-Simon Laplace 's five volume work Mécanique Céleste ( Celestial Mechanics ) , by the age of fifty achieving his goal of sufficient mathematical knowledge to comprehend the scope of its methods .
 Augustus De Morgan, Pierre-Simon Laplace
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Augustus De Morgan, Pierre-Simon Laplace