I have defined the following function in Mathematica
al[z_] := (a/((1 + a*(b/(2 Pi))*Log[z/Mz])))
b are defined constants) Now I want to put in a variable
x that I will integrate over from 0 to 100, but for low values of
x (up to 3) I want the function
al to be fixed, i.e.,
z should be 3 for
x < 3 and
x > 3.
However, I only want this constraint on
al when I fill in
x. Any ideas on how to do this?