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UpSetDelayed and N


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


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