This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
 BUILT-IN MATHEMATICA SYMBOL

# Constant

 Constantis an attribute that indicates zero derivative of a symbol with respect to all parameters.
• Functions are taken to have zero total derivative if f has attribute Constant.
• Mathematical constants such as Pi have attribute Constant.
is a mathematical constant representing a number:
is not explicitly a number:
is numeric and evaluates to a number with N:
Define f to be a constant function for total derivatives computed with Dt:
is a mathematical constant representing a number:
 Out[1]=
is not explicitly a number:
 Out[2]=
is numeric and evaluates to a number with N:
 Out[3]=
 Out[4]=

Define f to be a constant function for total derivatives computed with Dt:
 Out[2]=
 Scope   (2)
The built-in system mathematical constants:
They are all NumericQ:
They all represent exact values that can be evaluated to numbers of any precision with N:
Define f locally to be a constant function:
This does not affect subsequent computations with Dt:
Using the Constants option in Dt is similar, but has completely unambiguous output:
New in 1