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Principle
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===As scientific law=== [[Archimedes' principle]], relating buoyancy to the weight of displaced water, is an early example of a [[law (principle)|law]] in science. Another early one developed by [[Malthus]] is the ''population principle'', now called the [[Malthusian principle]].<ref>Elwell, Frank W. [http://www.faculty.rsu.edu/users/f/felwell/www/Theorists/Essays/Malthus1.htm "T. Robert Mathus's Principle ...."] ''Rogers State University''. 2013. 25 October 2017.</ref> Freud also wrote on principles, especially the [[reality principle]] necessary to keep the id and [[pleasure principle (psychology)|pleasure principle]] in check. Biologists use the [[principle of priority]] and [[principle of Binominal nomenclature]] for precision in naming [[species]]. There are many principles observed in physics, notably in [[cosmology]] which observes the [[mediocrity principle]], the [[anthropic principle]], the [[principle of relativity]] and the [[cosmological principle]]. Other well-known principles include the [[uncertainty principle]] in [[quantum mechanics]] and the [[pigeonhole principle]] and [[superposition principle]] in mathematics.
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