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標題: derive of 1st ofer linear ode [打印本頁]

作者: 36661124 時間: 11-9-9 10:34 PM 標題: derive of 1st ofer linear ode

http://en.wikipedia.org/wiki/Linear_differential_equation
please see the First order equation

A linear ODE of order 1 with variable coefficients has the general form

Dy(x) + f(x)y(x) = g(x).

Where D is the differential operator. Equations of this form can be solved by multiplying the integrating factor

So my question is : why we multiply a integrating factor and how can we know multiply integrating factor in this step but not in other steps??

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