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Action at a distance is the concept in physics that an object's motion can be affected by another object without the two being in physical contact; that is, it is the concept of the non-local interaction of objects that are separated in space. Coulomb's law and Newton's law of universal gravitation are based on action at a distance.
Forces and Fields has eleven chapters. The first ten chapters consist of 5 or more sections. The eleventh, 2 sections. These chapters are titled The Logical Status of Theories, The Primitive Analogies, Mechanism in Greek Science, The Greek Inheritance, The Corpuscular Philosophy, The Theory of Gravitation, Action at a Distance, The Field Theories, The theory of Relativity, Modern Physics, and ...
This example, from the Perl programming language, demonstrates an especially serious case of action at a distance (note the $[variable was deprecated in later versions of Perl [1]): Array indices normally begin at 0 because the value of $[ is normally 0; if you set $[ to 1, then arrays start at 1, which makes Fortran and Lua programmers happy ...
This is an alternative to the concept of instantaneous, or "non-local" action at a distance. Locality evolved out of the field theories of classical physics. The idea is that for a cause at one point to have an effect at another point, something in the space between those points must mediate the action. To exert an influence, something, such as ...
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The action is defined by an integral, and the classical equations of motion of a system can be derived by minimizing the value of that integral. The action principle provides deep insights into physics, and is an important concept in modern theoretical physics. Various action principles and related concepts are summarized below.
George Musser (born 1965) is a contributing editor for Scientific American magazine in New York and the author of The Complete Idiot’s Guide to String Theory [1] and of Spooky Action at a Distance. [ 2 ]
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