- #1

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x=y+Ay^2+By^3+Cy^4....

to y=ax+bx^2+cx^3 ...

without the lagrange theorem... must go from x=y+Ay^2+By^3+Cy^4.... to y=ax+bx^2+cx^3 ...

Need help thanks!

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- Thread starter Nishkin
- Start date

- #1

- 1

- 0

x=y+Ay^2+By^3+Cy^4....

to y=ax+bx^2+cx^3 ...

without the lagrange theorem... must go from x=y+Ay^2+By^3+Cy^4.... to y=ax+bx^2+cx^3 ...

Need help thanks!

- #2

Tom Mattson

Staff Emeritus

Science Advisor

Gold Member

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Nested Derivatives: A simple method for computing series expansions of inverse functions

Basically, if you know f(x) then the method in that paper allows you to find a power series for f

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