The ordinary derivative of a function of two or more variables with respect to one of the variables, the others being considered constants. If the variables are x and y, the partial derivatives of f(x, y) are written δf/δx and δf/δy, or Dxf and Dyf, or fx and fy. The partial derivative of a variable with respect to time is known as the local derivative.
Related category CALCULUS AND ANALYSIS
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