Maxima -- GPL CAS based on DOE-MACSYMA / Bugs / #2527 exponent too big in limit

#2527 exponent too big in limit

Milestone: None

Status: closed

Owner: Dan Gildea

Labels: Lisp Core - Limit (122)

Priority: 5

Updated: 2013-01-01

Created: 2012-12-29

Creator: Robert Dodier

Private: No

limit ((cosh(sqrt(x+1))-cosh(sqrt(x)))^(1/sqrt(x)),x,inf );
 => Maxima encountered a Lisp error:
  overflow during multiplication of large numbers

The immediate cause is that Maxima wants to calculate (POWER '4 '-7431782400)
but I didn't investigate what chain of events led to that.

Example above is with Clisp. CMUCL gives a similar error while SBCL and ECL simply grind away indefinitely.

Additional discussion: http://www.math.utexas.edu/pipermail/maxima/2012/030337.html

Discussion

Dan Gildea - 2013-01-01

status: open --> closed

assigned_to: Dan Gildea
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Dan Gildea - 2013-01-01

Fixed in tlimit.lisp

taylim: remove $logcontract to keep nested taylor expansions
from exploding.

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