Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.In the sciences generally, a scientific theory (also empirical theory) comprises a collection of concepts, including abstractions of observable phenomena expressed as quantifiable properties, together with rules (called scientific laws) that express relationships between observations of such concepts. A scientific theory is constructed to conform to available empirical data about such observations, and is put forth as a principle or body of principles for explaining a class of phenomena. A scientific theory can be considered a deductive theory, in that its content could be expressed in some formal system of logic in which its elementary rules are taken as axioms. In a deductive theory, any sentence which is a logical consequence of one or more of the axioms is also a sentence of that theory.
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