Re: D[...] change in 5.1

• To: mathgroup at smc.vnet.net
• Subject: [mg58697] Re: D[...] change in 5.1
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Fri, 15 Jul 2005 03:02:12 -0400 (EDT)
• Organization: The Open University, Milton Keynes, England
• References: <db57qa\$4ri\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Alexei Akolzin wrote:
> Hi,
>
> In previous version two lines below seemed to work as intended:
>
> In:
> n /: D[n[i_], x[j_], NonConstants -> {n,r}] := (1/r)( d[i,j] - n[i] n[j] );
> D[ 1 + n[k], x[l] ]
>
> Out: (-n[k] n[l] + d[k,l]) \ r
>
> But now in ver 5.1 I get something like:
> Out: D[n, x[l], NonConstants -> {J, r, n}] (1)
>
> The funny part is that D[ n[k], x[l] ] is recognized and substituted by the
> expression associated with definition of n.
>
> I wonder whether there is a possibility to get Mathematica 5.1 recognize
> n[k] as an indexed symbol n.
>
> Thanks.
> Alexei Akolzin.
>
Hi Alexei,

Have you posted the correct expression? I am asking because here what I
get with Mathematica 5.1.1:

In[1]:=
n /: D[n[i_], x[j_], NonConstants -> {n, r}] :=
(1/r)*(d[i, j] - n[i]*n[j]);

In[2]:=
D[1 + n[k], x[l]]

Out[2]=
0

In[3]:=
Information["n", LongForm -> False]

n

n /: D[n[i_], x[j_], NonConstants -> {n, r}] :=
(1/r)*(d[i, j] - n[i]*n[j])

In[4]:=
\$Version

Out[4]=
"5.1 for Microsoft Windows (January 27, 2005)"

Best regards,
/J.M.

```

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