Zero check for certain numbers fail

asked 2022-12-15 10:03:53 +0100

philipp7
391 ●6 ●12 ●28

The following zero check yields an error in my copy of Sage (version 9.5):

real_part(log(QQbar((-1)^(1/3)))).is_zero()

The result of the computation should be True. The entire error message can be found here: https://pastebin.com/iYNjuwZJ I also checked the Sage Cell Server and the same error appears there. I could not find anything related on the Trac server. However, since I have no idea what is going wrong here, my search was very limited.

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From the log it seems that your sage is missing maxima. Could you try to run the command maxima(1)?

vdelecroix ( 2022-12-18 10:41:44 +0100 )edit

maxima(1) works in my installation and gives me a sage.interfaces.maxima.MaximaElement object.

philipp7 ( 2022-12-19 08:59:16 +0100 )edit

Could you give more details about your setup (operating system, how you did install Sage).

vdelecroix ( 2023-01-20 20:21:33 +0100 )edit

I install it by calling makeafter cloning form the github repo as described here: https://ask.sagemath.org/question/431... My OS is openSUSE Leap 15.2

philipp7 ( 2023-01-25 09:21:41 +0100 )edit

Then there was probably a problem in the compilation process. If you want a diagnosis you should post the files $SAGE_ROOT/config.log, $SAGE_ROOT/config.status and possibly the full $SAGE_ROOT/logs/install.log.

vdelecroix ( 2023-01-25 09:44:15 +0100 )edit

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sage: (-1)^(1/3) (-1)^(1/3) sage: QQbar((-1)^(1/3)) 0.500000000000000? + 0.866025403784439?*I sage: log(QQbar((-1)^(1/3))) log(0.500000000000000? + 0.866025403784439?*I) sage: real_part(log(QQbar((-1)^(1/3)))) log(1.000000000000000?) sage: real_part(log(QQbar((-1)^(1/3)))).is_zero() True

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BTW : this "triple check" isn't really necessary. Guess why...

Emmanuel Charpentier ( 2022-12-16 08:26:33 +0100 )edit

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