Thanks for the quick reply! Could you explain, or tell me what to search,
what exactly "SR("y%s"%i)" does? Is SR Symbolic Ring? Also, the output for
the sum is close to perfect, though it gives me:
y1 + y10 + y11 + y12 + y13 + y14 + y15 + y16 + y17 + y18 + y19 + y2 + y20 + y3
+ y4 + y5 + y6 + y7 + y8 + y9
So, the order is a bit messed up. I wasn't sure if there was an easy way to fix
that.
Also, running it with
R.<y> = InfinitePolynomialRing(QQ)
sum([5^k*y[k] for k in [1..20]])
Seems to run for a very long time
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