Jisho

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せつどう 摂動
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Noun, Noun which may take the genitive case particle 'no'
1. perturbation​Physics
Wikipedia definition
2. Perturbation theory​Perturbation theory comprises mathematical methods that are used to find an approximate solution to a problem which cannot be solved exactly, by starting from the exact solution of a related problem. Perturbation theory is applicable if the problem at hand can be formulated by adding a "small" term to the mathematical description of the exactly solvable problem.
Read “Perturbation theory” on English Wikipedia
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Read “Perturbation theory” on DBpedia

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