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I am writing a document in LaTeX and since I use quite often the command ${\rm d}$ for inserting the differential in the integrals , I decided to make a new command and insert in the preamble.

I wrote it as: \newcommand{\d}{d} but it does not compile. It say "your command has been ignored. What am I doing wrong here? How can I insert the command to work properly ?

marked as duplicate by egreg macros May 10 '15 at 12:27

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    Related: tex.stackexchange.com/q/14821/14757 or tex.stackexchange.com/q/178946/14757 or search for differential here in TEX.SE. – Sigur May 10 '15 at 11:50
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    Please have a look at packages like physics or skamth or ... – Johannes_B May 10 '15 at 11:50
  • you probably got the error ! LaTeX Error: Command \d already defined. \d is one of the "predefined" accent commands. it's not a good idea to try to redefine it. – barbara beeton May 10 '15 at 12:11
  • @barbarabeeton I did not know that. Anyway, thanks for the links. I'll check them out. It is that I do not use commands that often, expect for defing new theorems of new definitions or lemmas etc. – Tolaso May 10 '15 at 12:17
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May I suggest

\newcommand{\dee}{\mathop{\mathrm{d}\!}}

to be used as follows:

\int_0^1 x\dee x = \frac{1}{2}
  • It is a good command. Also the links given above helped me declare a new command. Thank you! – Tolaso May 10 '15 at 12:19
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    @Tolaso No, it isn't good. Try $\frac{\dee y}{\dee x}$ to know why. – egreg May 10 '15 at 12:28
  • @Tolaso - I've posted an improved version of the \dee macro, which should pass egreg's muster. :-) – Mico May 10 '15 at 14:31
  • @egreg Ohh... I did not try that. Thanks for the observation. – Tolaso May 10 '15 at 19:07

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