Question

What does D^n (ln x) means?

Answer 1

it means to differentiate that function (ln x) , 'n' number of times.

Answer 2

like D^2 (ln x) = D (d/dx (ln x)) = D (1/x) = d/dx (1/x) = -1/x^2
D^2 ----differentiate 2 times.

Answer 3

thanks!
It's easier now:)

Answer 4

welcome ^_^

Answer 5

Ah, the joys of notation! Never saw that one before... seems like math notations breed when nobody is looking.

Answer 6

lol

Answer 7

like earphones tie themselves when nobody's looking :P

Answer 8

No, no. That is a law of Physics. The Convolution Factor of Strings and String Like Materials. Where as notation just breeds. Look at how many different ways there are to write a matrix! Some don't even use | in an augmented matrix.

Answer 9

ohh....never knew that! was just cursing the earphones all this time, when i should've cursed physics....

Answer 10

Yep!