If the range r is small (as in a crystal), the one gets numerical formulations and parallel computing considerations similar to those in Laplace example with local communication
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We showed in Laplace module that efficiency increases as range of force increases
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If r is infinite ( no cut-off for force) as in gravitational problem, one finds rather different issues which we will discuss in this module
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There are several "non-particle" problems discussed later that reduce to long range force problem characterized by every entity interacting with every other entity
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Characterized by a calculation where updating entity i involves all other entities j
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