You have chosen 'To be is to be the value of a variable..' by George Boolos, 'Letters to Johann Bernoulli' by Gottfried Leibniz and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell
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A. | Basis of Science | |
B. | Scientific Theories | |
C. | Induction | |
D. | Explanation |