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Re: Keeping the correct order

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  • Subject: [mg132346] Re: Keeping the correct order
  • From: Oliver Jennrich <oliver.jennrich at gmx.net>
  • Date: Sat, 15 Feb 2014 04:02:34 -0500 (EST)
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Kevin <kjm at KevinMcCann.com> writes:

> I am doing some calculations that have terms like (1+h)(1+h'+h''). I 
> wish to do something like Series with this but only keep terms that are 
> up to some order in h. The kicker is that the derivatives are also of 
> the same order as h. How can I tell Mathematica about this?

If you don't mind a dirty trick:

(1 + h) (1 + h' + h'') /. {h -> a h, Derivative[n_][h] -> a Derivative[n][h]}

Normal@Series[%, {a,0,1}] /. a-> 1

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