Opened 9 years ago
Closed 9 years ago
#637 closed bug (fixed)
nc_algebra: additional check needed
Reported by: | Owned by: | Oleksandr | |
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Priority: | minor | Milestone: | 4-1-0 and higher |
Component: | dontKnow | Version: | 4-0-0 |
Keywords: | Cc: | aheinle@… |
Description (last modified by )
It turned out, that nc_algebra either does not check or checks incorrectly whether the nonzero elements in the first argument (structure constants) are invertible. For instance,
ring r = 0,(x,d),dp; def R = nc_algebra(x^2,0); setring R;
should return an error since x2 is not invertible in r. Instead, just a commutative ring is returned. Tested with both 3-1-7 and 4-0-0. The problem applies to matrices in the first argument as well:
ring r=0,(x,y),dp; matrix C[2][2]=0,x^2, 0,0; def R = nc_algebra(C,0); setring R;
Notably, "R;" print commutative R but with the field "noncommutative relations:", that is the attempt of providing R with noncommutative structure has been tried.
Thanks in advance.
Change History (4)
comment:1 Changed 9 years ago by
Owner: | changed from somebody to Oleksandr |
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Status: | new → assigned |
comment:2 Changed 9 years ago by
Description: | modified (diff) |
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comment:4 Changed 9 years ago by
Resolution: | → fixed |
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Status: | assigned → closed |
pushed as 5faa0e147458dacf2fbe178a3ebe9b2d0957424b
i have simplified 2nd test.