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[Maxima-bugs] [maxima:bugs] #4573 taylor internal error in limit
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From: Barton W. <wil...@us...> - 2025-06-30 21:06:57
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**Additionally** The two extra cases I experimentally added are surely wrong (they appear to be indeterminate forms), or maybe I'm way off in my understanding of what the function `lim-times` is supposed to do.
Collecting lists of the form `[input1, input2, output]`, and running the testsuite we have:
~~~
{[inf, inf, inf], [inf, minf, minf], [inf, im, infinity],
[inf, pos, inf], [minf, inf, minf], [minf, im, infinity], [minf, pos, minf],
[im, inf, infinity], [neg, inf, minf], [neg, minf, minf], [neg, im, im],
[neg, pos, neg], [pos, inf, inf], [pos, pos, pos], [zero, inf, zero]}
~~~
Again, it really seems that the case `zero x inf -> zero` is wrong.
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**[bugs:#4573] taylor internal error in limit**
**Status:** open
**Group:** None
**Labels:** taylor
**Created:** Sat Jun 21, 2025 08:06 AM UTC by Stavros Macrakis
**Last Updated:** Mon Jun 30, 2025 12:39 PM UTC
**Owner:** nobody
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taylor(x^(1/log(log(x))),x,inf,1);
debugger invoked on a SIMPLE-CONDITION in thread
#<THREAD tid=259 "main thread" RUNNING {1001258003}>:
Undefined limit product $INF * $ZEROB in lim-times
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Maxima 5.47.0 SBCL 2.4.9 on MacOS
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