Proof of second order derivative

1. Apr 10, 2009

manish15689

How to prove that

y''=d2y/dx2

if y=f(x)

2. Apr 10, 2009

arildno

???
That's just expressing the equivalence between two different types of notation conventions..

3. Apr 10, 2009

manish15689

i want to know how does the notation d2y/dx2 come into existence...

4. Apr 10, 2009

arildno

Leibniz introduced it. Why would that be of any interest??