In the following code the computation seems to run forever, even hitting 
Ctrl-C doesn't stop that.

k.<b,c> = QQ[]
l = k.fraction_field()
r.<x> = l[]
A = 2*(x^4+x^40)+b*(x^8+x^36)+c*(x^12+x^32)
B = A.subs(1/x)

If I drop the factor 2* in A=..., then I instantly get the correct result. 
I'm running Sage 5.10.

I know that factorizations of multivariate polynomials always has been a 
mess in Sage, but I'm surprised to see that even a trivial formal 
computation doesn't work reliably.

-- Peter Mueller


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