I am just learning Pharo (taking the MOOC actually!) and am wondering whether
it is possible to model formal power series.  I have done this in Haskell
quite easily and efficiently, but struggled to do it in Python without real
success.  It requires one to perform operations on an infinite stream (such
as multiplying two infinite power series).  One then only evaluates the
terms as they are needed, i.e., lazily.  Any thoughts?

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