Partial Differential Equations - University of Toronto …
https://www.math.toronto.edu/ivrii/PDE-textbook/PDE-textbook.pdf
WEBA partial differential equationis an equation for a function which depends on more than one independent variable which involves the independent variables, the function, and partial derivatives of the function: F(x,y,u(x,y),u x(x,y),u y(x,y),u xx(x,y),u xy(x,y),u yx(x,y),u yy(x,y)) = 0. This is an example of a PDE of order 2. Solving an equation ...
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