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partial differential equation
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differential equation that contains unknown multivariable functions and their partial derivatives
A partial differential equation is a mathematical statement that involves an unknown function depending on multiple variables (like position and time) and relates how that function changes when you vary each variable separately. These equations are fundamental to physics and engineering because they describe how quantities like temperature, pressure, and electric fields evolve and vary across space and time.
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Excerpted from Wikipedia’s “partial differential equation” article, available under the CC BY-SA 4.0 licence.