newbie question about the symbol E

*To*: mathgroup at smc.vnet.net*Subject*: [mg28310] newbie question about the symbol E*From*: "Martin P. Pos" <posmpxxxx at xxxxhome.nl>*Date*: Mon, 9 Apr 2001 02:58:08 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

I want to declare a function of energy E, say f[E], but mathematica doesn't allow me to use E as a symbol, because it is reserved for the exponential constant. In the frontend I use <esc>ee<esc> to enter that exponential constant, but i want E to be the variable of this function. Similar, I can declare a constant, e.g.: Subscript[E, F] := 10 But when I do: Clear[Subscript[E, F]] mathematica responds: "Clear::ssym : eF is not a symbol or string" where eF is the exponential constant, subscript F. I want to enter the following formula: f[x_] := 1/(1 + E^((Subscript[x, F] - x)/(k*T))) where E should be the exponential constant and x should be E (capital e) Is there a way to do what I want, or is it not possible to use E? Regards, Martin P. Pos