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PatternMatching with Dt[]

• To: mathgroup at smc.vnet.net
• Subject: [mg37264] PatternMatching with Dt[]
• From: "Johannes Ludsteck" <johannes.ludsteck at wiwi.uni-regensburg.de>
• Date: Mon, 21 Oct 2002 02:29:28 -0400 (EDT)
• Organization: Universitaet Regensburg
• Sender: owner-wri-mathgroup at wolfram.com

I would like to replace Dt[x_] in a complex 
expression. For example consider

Dt[x]/.Dt[arg_]->f[arg]

where x is a pure Symbol (has no value).
However, Mathematica refuses apply the rule.
Various other attempts, for example 
Unevaluted[Dt[arg_]]:>f[arg]
and HoldForm[...] were unsuccessful.

I managed to  circumvent the problem by
Dt[x]/.Dt->fun
However, I were more happy if I understood why the 
first attempt was not successful.
Can someone explain?

Best regards,
	Johannes Ludsteck
<><><><><><><><><><><><>
Johannes Ludsteck
Economics Department
University of Regensburg
Universitaetsstrasse 31
93053 Regensburg
Phone +49/0941/943-2741