Definition of exact differential
: a differential expression of the form X1dx1 + … + Xndxn where the X's are the partial derivatives of a function f(x1, … , xn) with respect to x1, … , xn respectively
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“Exact differential.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exact%20differential. Accessed 22 Oct. 2021.
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The first known use of exact differential was in 1825
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