UpSetDelayed and N

*To*: mathgroup at smc.vnet.net*Subject*: [mg57128] UpSetDelayed and N*From*: "François Wirion" <muthaluva at gmail.com>*Date*: Mon, 16 May 2005 21:35:26 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hello, I have done the following in Mathematica: P[N[x]] ^:= 0 If I put in P[N[x]] it returns 0 as expected. However, I haven't been able to find where this definition is stored. Calling the following for P OwnValues[P] DownValues[P] UpValues[P] SubValues[P] NValues[P] DefaultValues[P] FormatValues[P] Messages[P] and N OwnValues[N] DownValues[N] UpValues[N] SubValues[N] NValues[N] DefaultValues[N] FormatValues[N] Messages[N] returns mostly empty lists, but no definition that says that P[N[x]] is 0. Where then would this be stored? Thank you for any help or advice, François Wirion

**Follow-Ups**:**Re: UpSetDelayed and N***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: UpSetDelayed and N***From:*Chris Chiasson <chris.chiasson@gmail.com>