Alec,

Thank you very much for your explanation!

Do you known about any book or other texts that explain more about it ?

I would like to create some examples of maximum likelihood estimation using this symbolic approach. 

Best regards,

Pedro

Hello,

I am having trouble in defining multivariable functions. For instance, when I define the follow code:

assume(n>0)

 f:=(x_1,x_2,...,x_n) -> sum(x[i],i=1..n)

I get the error: Error, invalid operator parameter name.

How can I define this type of function when the number of variables is conditional on "n" ?