I think this was asked a few years ago... anyway, I'm doing some
computations for which Maxima's "tellrat(X)", which basically means
substitute 0 for X wherever it occurs in a rational expression, is useful,
It stops expressions growing huge by simply and automatically making vast
unnecessary chunks of them zero. However, if I want to do this in Sage I
either have to start a Maxima sub-shell, or use maxima("do this"), or
maxima.do_this(), and move expressions to and fro between Sage and Maxima.
This is all do-able, but also a pain. Is there any way of limiting
expressions in Sage (for example an expansion of nested Taylor polynomials)
by automatically making all powers above a certain value zero?
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