Question

Hi, anyone please recommend best explanatory material for the D operator method of solving ordinary differential equations?

Answer 1

D(some function) = that function's derivative


Ex: f(x) = x^2+9x


D( f(x) ) = D( x^2+9x ) = 2x+9

Answer 2

so instead of saying \[\Large \frac{dy}{dx}\], you can shorten it and just say D (keep the context in mind though)

Answer 3

one can also add a subscript to indicate the variable you are differentiating with respect to...

\[D_x(f(x))=\frac{d}{dx}f(x)=f'(x)\]