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#127 limit asks sign of IND
limit(abs(sin(x)),x,inf)
foolishly asks the user
Is IND positive, negative, or zero?
Moreover, if the user foolishly replies zero, Maxima gets
into an infinite loop!
(Note that the only case where Limit(abs(IND)) should
not return IND is if the limit set consists exactly of { x , -
x } for some x. This does happen, it is true, but Limit
has far less subtle bugs.... Yes, I know, single-
argument Limit only handles the various INFs, not IND
and UND.)
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Observed in 5.9.3.
This may be due in some part to a bug or wart in asksign --
if asksign is asked about ind, it may see that ind is
neither pos nor neg nor zero & therefore ask the user about
ind. Seems like asksign should return ind. But that in turn
supposes that the caller knows how to cope with a ind return
value. Just a thought.
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Originator: NO
fixed in limit.lisp rev 1.41
(%i4) limit(abs(sin(x)),x,inf);
(%o4) ind
See also bug 1629723.