exact differential

Variable partial derivative times variable differential is variable change {exact differential}: (Df(x,y) / Dx) * dx = (x change), where f(x,y) is a two-variable function, D is partial derivative, and dx is differential. For all variables, sum exact differentials. For two variables, (Df(x,y) / Dx) * dx + (Df(x,y) / Dy) * dy = (x change) + (y change). First-order differential equation can use differentials.

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Date Modified: 2022.0224