spielwiese
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Last change
on this file since a7efa79 was
a7efa79,
checked in by Hans Schönemann <hannes@…>, 16 years ago
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*hannes: new book version
git-svn-id: file:///usr/local/Singular/svn/trunk@10182 2c84dea3-7e68-4137-9b89-c4e89433aadc
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Property mode set to
100644
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File size:
446 bytes
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| 1 | LIB "tst.lib"; |
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| 2 | tst_init(); |
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| 3 | |
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| 4 | ================================== example 1.9.28 ==================== |
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| 5 | |
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| 6 | LIB "ncalg.lib"; |
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| 7 | def U = makeUsl2(); // U(sl_2) over the rationals |
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| 8 | setring U; |
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| 9 | ring A = 0,(a),dp; |
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| 10 | def UA = U + A; |
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| 11 | setring UA; |
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| 12 | |
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| 13 | poly p = 4*e*f+h^2-2*h - a; |
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| 14 | // p is a central element of UA |
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| 15 | ideal I = e^3, f^3, h^3-4*h, p; |
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| 16 | // intersect I with the ring K[a] |
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| 17 | ideal J = eliminate(I,e*f*h); |
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| 18 | J; |
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| 19 | |
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| 20 | eliminate(I,h); |
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| 21 | |
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| 22 | eliminate(I,e*f*a); |
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| 23 | |
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| 24 | tst_status(1);$ |
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| 25 | |
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