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sagemath/sage
#247
bug in __contains__ for polynomial rings over ZZ
``` age: R. = ZZ['x,y,z,w'] sage: i = ideal(x^2 + y^2 - z^2 - w^2, x-y) sage: j = i^2 sage: j.groebner_basis() [y^2 - 2*x*y + x^2, y*w^2 + y*z^2 - 2*y^3 - x*w^2 - x*z^2 + 2*x*y^2, w^4 + 2*z^2*w^2 +…
ghost
updated
17 years ago
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