Jisho

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Noun, Suru verb
1. partial derivative; partial differentiationMathematics
Wikipedia definition
2. Partial derivativeIn mathematics, a partial derivative of a function of several variables is its derivative with respect to one of those variables, with the others held constant (as opposed to the total derivative, in which all variables are allowed to vary). Partial derivatives are used in vector calculus and differential geometry. The partial derivative of a function f with respect to the variable x is variously denoted by The partial-derivative symbol is ∂.
Read “Partial derivative” on English Wikipedia
Read “偏微分” on Japanese Wikipedia
Read “Partial derivative” on DBpedia

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