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## Main Question or Discussion Point

How to prove that

y''=d

if y=f(x)

y''=d

^{2}y/dx^{2}if y=f(x)

- Thread starter manish15689
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How to prove that

y''=d^{2}y/dx^{2}

if y=f(x)

y''=d

if y=f(x)

- #2

arildno

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???

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

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

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i want to know how does the notation d^{2}y/dx^{2} come into existence...

- #4

arildno

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Leibniz introduced it. Why would that be of any interest??i want to know how does the notation d^{2}y/dx^{2}come into existence...

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