Re: Stupid simple question about counting derivatives

• To: mathgroup at smc.vnet.net
• Subject: [mg33460] Re: Stupid simple question about counting derivatives
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 22 Mar 2002 04:06:36 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <a7crpm\$hu8\$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

you forgot a space between a and x

D[a x,x]  gives a

Dt[a x,x] gives a+x D[a,x]

as it should.

Regards
Jens

Jack wrote:
>
> How do I get Mathematica 2.2 to count the derivatives of the simplest
> parametric functions, i.e.
>
> (ax)', where a is the parameter and x is the variable. I want to get:
>
> a
>
> (Hey, I said it was stupid).
>
> D[ax,x] gets me 0, Dt[ax,x] gets me Dt[ax,x] and I haven't figured out
> how to use Constants and NonConstants. I'd be grateful for any help as
> this simple problem is driving me crazy.
>
> --
> Jacek Kie³czewski
> kielczew at poczta.onet.pl

```

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