Back to Forum | View unanswered posts | View active topics



Post new topic Reply to topic  Page 1 of 1
  [ 2 posts ] 
  Print view | E-mail friend Previous topic | Next topic 
Author Message
michaelk
 Post subject: qring of an nc_algebra
PostPosted: Mon Jan 22, 2018 9:13 pm 
I am running the following code in the "Try Online" section of the website (running version 4.1.0) from Nov. 2016:

Code:
LIB "nctools.lib";
ring A = 0,(a,b),dp;
def S = nc_algebra(-1,0);
setring S;
b^2==0;
ideal I = a^2;
qring R = twostd(I);
setring R;
b^2==0;


The first call of b^2==0 (after setring S) returns 0 (false), whereas the second call of b^2==0 (after setring R) yields 1 (true). I don't understand why this is the case, since b^2 is not be in the ideal generated by a^2. Am I doing something wrong?


Report this post
Top
  
Reply with quote  
hannes
 Post subject: Re: qring of an nc_algebra
PostPosted: Thu Feb 01, 2018 11:55 am 

Joined: Wed May 25, 2005 4:16 pm
Posts: 275
No, nothing wrong: you found a bug in Singular.
The test for being a SCA ring had a bug.
It is now fixed in the sources with
https://github.com/Singular/Sources/commit/4fd796a9c41904bd840bcc8a2691b4dac9865de4


Report this post
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 2 posts ] 

You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

It is currently Fri May 13, 2022 11:03 am
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group