Hello,
Maxima 5.14.0 http://maxima.sourceforge.net
Using Lisp GNU Common Lisp (GCL) GCL 2.6.8 (aka GCL)
When I do this:
simpsum:true$
sum((x[i]-sum(x[i],i,1,n)/n)^2,i,1,n)
The result is 0.
And just before sending this message I thought about problem on indices.
And effectively if I do:
ratsubst(i,j,sum((x[i]-sum(x[j],j,1,n)/n)^2,i,1,n))
this give the correct result.
I can file a bug report if necessary.
Laurent.