partial differential

noun Mathematics.
an expression obtained from a given function of several variables by taking the partial derivative with respect to one of the variables and multiplying by the increment in that variable.

Origin:
1810–20

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The partial differential equations are pretty tough to solve in general, but
  certain situations are too bad.
Problems such as these present computational scientists with systems of first
  order partial differential equations.
Numerical methods for the solution of partial differential equations of
  fractional order.
Adaptive mesh refinement for hyperbolic partial differential equations.
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