spielwiese
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Last change
on this file since e0b657 was
e0b657,
checked in by Hans Schönemann <hannes@…>, 17 years ago
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*hannes: ncalgebra -> nc_algebra
git-svn-id: file:///usr/local/Singular/svn/trunk@10367 2c84dea3-7e68-4137-9b89-c4e89433aadc
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-
Property mode set to
100644
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File size:
365 bytes
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| 1 | LIB "tst.lib"; |
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| 2 | tst_init(); |
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| 3 | ring r=(0,a),(e,f,h),Dp; |
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| 4 | matrix d[3][3]; |
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| 5 | d[1,2]=-h; |
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| 6 | d[1,3]=2e; |
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| 7 | d[2,3]=-2f; |
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| 8 | def S=nc_algebra(1,d); setring S; |
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| 9 | // it is parametric U(sl_2) |
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| 10 | ideal I=e2,f2,h2-1; |
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| 11 | I=std(I); |
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| 12 | ideal J=e,h-a; |
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| 13 | J=std(J); |
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| 14 | poly z=4*e*f+h^2-2*h; |
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| 15 | // z is the central element |
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| 16 | // the central character of I: |
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| 17 | NF(z,I); |
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| 18 | // the central character of J: |
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| 19 | NF(z,J); |
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| 20 | tst_status(1);$ |
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