Hi:

I'm a student majoring in Finance, and recentlly I am learning Maple.

But I found a question that I don't know how to deal with:

When learning Econometrics, and sometimes other subjects, we need to simplify a eq. like (X'*X)*b=X'*Y, where X,b,Y are Matrixes and we need to solve b.  And the kind  like that.