[Maxima-bugs] [maxima:bugs] #3041 limit(inf*(zeroa+inf)) => und, should be inf

[Barton W. <wil...@us...>]

The function  `toplevel-$limit` calls `($expand exp 1 0)`  before sending the limit to the main limit code.  Changing the the call to `($expand exp 0 0)` (for pure simplification) results in several testsuite failures, some of them serious.  Previously, I've attempted, but  failed to fix these bugs. 

As a workaround,  I'm experimenting with calling `($expand exp 0 0)` for expressions that are free of the limit variable and  otherwise call `($expand exp 1 0)`.

There is a source code comment about all this




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**[bugs:#3041] limit(inf*(zeroa+inf)) => und, should be inf**

**Status:** open
**Group:** None
**Labels:** limit 
**Created:** Sun Oct 25, 2015 07:30 PM UTC by Stavros Macrakis
**Last Updated:** Sun Oct 25, 2015 07:31 PM UTC
**Owner:** nobody


limit(inf(zeroa+inf)) => und, should be inf

single-arg limit should be true regardless of how the various parts reach the limits, i.e., in this case it is equivalent to the *multiple* limit:

      limit (a->inf, b->0+, c->inf) a*(b+c)
      
it looks like instead it is expanding to 

     inf * zeroa + infinf => und + inf => und


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