单词	exact differential
释义	exact differential If z = f(x,y) is a function of two variables then the total differential is . Then Pdx + Qdy is said to be an exact differential if it is the total differential of some function f. Further, Pdx + Qdy is exact if and only if ∂P/∂y = ∂Q/∂x. Compare total differential.
随便看	unit unitary matrix unitary ratio unit circle unit cube unit matrix unit square unit vector unity univalent universal covering space universal gravitational constant universal machine universal quantifier universal set unknot unknown unstable equilibrium upper bound upper limit upper triangular matrix Urysohn's lemma utility utility function V

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