Talk:Armor/@comment-89.156.3.186-20121220194141/@comment-89.156.3.186-20121220200553

how to seperate the function 1/(1+x+y)  into a product of two function of x and y ? 1/(1+x+y)=f1(x)*f2(y)

Is it possible pls ? What are f1 and f2 ????