A partial differential equation (PDE) is a mathematical equation that involves multiple independent variables, an unknown function that is dependent on those variables, and partial derivatives of the ...
https://doi.org/10.4169/college.math.j.45.1.011 https://www.jstor.org/stable/10.4169/college.math.j.45.1.011 Summary In textbooks, the familiar sine and cosine ...
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