Two dots on top of a character?

[Peter Percival]

Is there something like $\dot{c}$ that will put two dots side-by-side on
top of $c$? (Think Newton's notation for second derivative.)
--
Do, as a concession to my poor wits, Lord Darlington, just explain
to me what you really mean.
I think I had better not, Duchess. Nowadays to be intelligible is
to be found out. -- Oscar Wilde, Lady Windermere's Fan

[Jakob Mendel]

Am 22.08.2017 um 21:01 schrieb Peter Percival:
> Is there something like $\dot{c}$ that will put two dots side-by-side on
> top of $c$? (Think Newton's notation for second derivative.)

From Stefan Schwarz/Rudolf Potu\v{c}ek, Das \TeX{}ikon.
Referenzhandbuch f\"ur \TeX{} und \LaTeX{}:

\documentclass{article}
\def\ddot{\mathaccent"707F}
\begin{document}
$c$ $\dot{c}$ $\ddot{c}$
\end{document}

HTH,
Jakob

[Axel Berger]

Peter Percival wrote:
> Is there something like $\dot{c}$ that will put two dots side-by-side

Yes. \ddot{x} should always be available in math mode and with amsmath
there are also \dddot{x} and ddddot{x}. There is also stix math, where
they look a little different (worse imho).

Interestingly what I did not find there were x' x'' and x''' for by
length, by area and by volume (i.e. first to third derivatives by space
variables). Last time I needed them was decades ago and in handwriting,
but how do you write these in TeX?

Axel

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[Piet van Oostrum]

Axel Berger <Sp...@Berger-Odenthal.De> writes:

> Interestingly what I did not find there were x' x'' and x''' for by
> length, by area and by volume (i.e. first to third derivatives by space
> variables). Last time I needed them was decades ago and in handwriting,
> but how do you write these in TeX?

What about $x'$, $x''$ and $x'''$ ?

--
Piet van Oostrum <pie...@vanoostrum.org>
WWW: http://piet.vanoostrum.org/
PGP key: [8DAE142BE17999C4]

[Fred Smith]

On 2017-08-23, Piet van Oostrum <pie...@vanoostrum.org> wrote:
> Axel Berger <Sp...@Berger-Odenthal.De> writes:
>
>> Interestingly what I did not find there were x' x'' and x''' for by
>> length, by area and by volume (i.e. first to third derivatives by space
>> variables). Last time I needed them was decades ago and in handwriting,
>> but how do you write these in TeX?
>
> What about $x'$, $x''$ and $x'''$ ?
>

Or use \prime instead: $x^{\prime}$, $x^{\prime\prime}$ and
$x^{\prime\prime\prime}$. Makes a vertical quote.

[Axel Berger]

Piet van Oostrum wrote:
> What about $x'$, $x''$ and $x'''$ ?

You're right, I should have hat more faith in TeX's mathematical mode.
Offhand I was not sure, that $x'''$ and \textit{x'''} really look as
differently as they do. As I said, after a change of discipline I have
not used math mode in ages.

Danke