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 P: 139 i will express some function y as follows as its ordinary derivative dy/dt=y (can i say like this-the change in y value with respect to change in t value at the point t will be equal to the y value at t) Can somebody explain a partial derivative like the above statement What is so special in a partial differential equation that it requires so many methods as follows. What is the difficulty that makes the ode and pde different in their solution 1)fem 2)bem 3)fdm 4)fvm