Re: Stupid simple question about counting derivatives

• To: mathgroup at smc.vnet.net
• Subject: [mg33469] Re: [mg33437] Stupid simple question about counting derivatives
• From: Fernando Rinaldi <fernando.rinaldi at e-technik.uni-ulm.de>
• Date: Fri, 22 Mar 2002 04:06:50 -0500 (EST)
• References: <200203211427.JAA18170@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```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.

HI!
don't forget that ax is a new symbol...you mean for sure a*x.....
D[a*x,x]=a try.....and never forget..a*x is NOT!!! ax

be careful and good work

```

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