Ciao Gianluca,
I don't know what is the reason of NumberString, I copied and pasted this line from the following discussion: "How to set the working precision globally? $MinPrecision does not work".
Link:
https://mathematica.stackexchange.com/questions/38114/how-to-set-the-working-precision-globally-minprecision-does-not-work
Now I document myself on the scope of every function in this line.
Saluti,
Nico
