#1109 limit(%e^b*erf(x), x, inf) asks sign(b)

closed
nobody
3
2007-11-25
2007-02-07
No

(%i10) limit(%e^b*erf(x), x, inf);
Is b positive, negative, or zero?

pos;
b
(%o10) %e

Maxima version: 5.11.0cvs
Maxima build date: 21:36 2/7/2007
host type: i686-pc-linux-gnu
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.6

Discussion

  • Robert Dodier

    Robert Dodier - 2007-02-08
    • labels: --> Lisp Core - Limit
     
  • Stavros Macrakis

    • priority: 5 --> 3
     
  • Stavros Macrakis

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    Reduced priority to 3. Result is correct, even if question is unnecessary. Maxima alas asks lots of unnecessary questions.

     
  • Raymond Toy

    Raymond Toy - 2007-02-22

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    For the record, the question comes from pos-neg-p in forq.

    Perhaps limit1 should factor out terms not involving the limit variable?

     
  • Dan Gildea

    Dan Gildea - 2007-11-25
    • status: open --> closed
     
  • Dan Gildea

    Dan Gildea - 2007-11-25

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    Fixed in limit.lisp rev 1.47 - forq skips terms not involving limit var.

    (%i48) limit(%e^b*erf(x), x, inf);
    (%o48) %e^b

     

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