complex and real infinity in Sage

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Feb 11, 2010, 12:15:34 PM2/11/10
to sage-devel
Dear Sage

Lenka Viskotova found a bug in evaluating limits in Sage. Evaluating
limits via Maxima may return complex infinity or real ininity. Sage
does not distinguish between them. As a consequence, limit(1/x,x=0) is

I was not able to find report on this and thus reported this as

A quick fix could be to return NaN if maxima returns "infinity" and
+Infinity if maxima returns "inf". But I think that similar problem
may appear in other commands as well. Any idea how to distinguish real
and complex ininifty in Sage?

Robert Marik

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