cannot calculate limit

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answered 2015-01-30 13:05:31 +0100

tmonteil
27413 ●31 ●204 ●517 http://wiki.sagemath.o...

updated 2015-01-30 13:07:48 +0100

I do not know exactly why, probably a regression in maxima. If you really want to know, you should provide a smaller interval of versions than (4.7, 6.4.1) so that we can have a look at the guilty commit. That said, you can still ask sympy to do that:

sage: limit(u(n=n+1)/u,n=infinity, algorithm="sympy")
0

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Thanks ! Note that converting to exponentials works. My best interval is (4.7, 5.8), sorry

marguin ( 2015-01-30 13:52:04 +0100 )edit

This does not evaluate (returns the question) in 5.2. So it's been a while. Thierry, maybe you can isolate the Maxima command and report upstream?

kcrisman ( 2015-01-30 15:00:35 +0100 )edit

I never used maxima commands (nor maxima itself), but if you give me some hints me how to do that, i will be glad to.work on it.

tmonteil ( 2015-02-01 18:10:51 +0100 )edit

The maxima command is: limit((1+sqrt(n+1))^(-n-1)/(1+sqrt(n))^(-n),n,inf)

Returns zero with Maxima 5.24.0 and is not evaluated when running in http://sagecell.sagemath.org/

robert.marik ( 2015-02-01 23:36:56 +0100 )edit

Thanks @robert.marik - I reported this upstream at https://sourceforge.net/p/maxima/bugs...

kcrisman ( 2015-02-03 15:22:36 +0100 )edit

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