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The Economy of Physical Theory
Abstractive and Hypothetical Theories
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algebra analogous analytical argument arithmetic asserted atomic axioms believe bodies Boyle's law called conceive concept consequences consider deductive defined definitions discovery electricity elementary particles ellipse empirical equal Ernst Mach Euclidean geometry example existence experience experimental laws explain facts force formulated fundamental hypothesis idea induction inference intuition Kant Kepler kind knowledge Leibniz length light rays logical mathematical mathematical induction mathematician matter means measurement mechanical method mind motion Newton non-Euclidean non-Euclidean geometry objects observations operation orbit particular Peano postulates Peano's phenomena philosophers physical theory physicist Pierre Duhem planets Poincare possible postulates predictions principles priori problem problem of demarcation problem of induction proof properties propositions purely quantity question ratio scales reality reason relations represent result rules scale scientific scientist sense simple space statements straight line syllogism synthetic synthetical proposition temperature theorems things tion triangle true truth validity