#1159 tlimit(s/(1+s^2)/sinh(x*T), s, inf)

closed
nobody
5
2007-09-08
2007-03-31
Anonymous
No

In Maxima 5.11.0:

tlimit(s/(1+s^2)/sinh(x*T), s, inf);
Is T positive, negative, or zero?
p
Invalid call to var-expand.

(Cf. Maxima list: March 31, 2007, "bug in tlimit?").

Stavros mentioned on the list that
taylor(exp(x)-exp(-x), x, inf, 2) returns a sensible result whereas taylor((exp(x)-exp(-x))/2, x, inf, 2)
triggers an internal error.

Discussion

  • Robert Dodier

    Robert Dodier - 2007-06-29
    • labels: --> Lisp Core - Limit
     
  • Dan Gildea

    Dan Gildea - 2007-09-08
    • status: open --> closed
     
  • Dan Gildea

    Dan Gildea - 2007-09-08

    Logged In: YES
    user_id=1797506
    Originator: NO

    fixed in hayat.lisp rev 1.27

    (%i21) tlimit(s/(1+s^2)/sinh(x*T), s, inf);
    Is x*T positive or negative?
    pos;
    (%o21) 0

    (%i22) taylor((exp(x)-exp(-x))/2, x, inf, 2);
    (%o22) 1/(2*%e^-x)-%e^-x/2

     

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