Request "order",n,0
expr(n)»n
seq((x-a)^i*(x-b),i,1,n)»list
m1*x+m2+Ó(expr("a"&string(i))*list[i],i,1,n)»ud(x)
but ud(x) is not a function of x anymore!
for example for n=2 and m1=m2=0 and a=0 and b=1,ud(x)=x*(x-1)*(a2*x+a1) but ud(y)=x*(x-1)*(a2*x+a1) !!!
how can I fix this? Thank you