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Although Descartes did not pursue the subject , he preceded Gottfried Wilhelm Leibniz in envisioning a more general science of algebra or " universal mathematics , " as a precursor to symbolic logic , that could encompass logical principles and methods symbolically , and mechanize general reasoning .
 Descartes, Gottfried Wilhelm Leibniz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Descartes, Gottfried Wilhelm Leibniz