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19 changes: 19 additions & 0 deletions src/sage/rings/polynomial/multi_polynomial_libsingular.pyx
Original file line number Diff line number Diff line change
Expand Up @@ -5298,6 +5298,25 @@ cdef class MPolynomial_libsingular(MPolynomial_libsingular_base):
self._parent._singular_().set_ring()
return self._repr_short_()

def _singular_(self, singular=None):
"""
Override :meth:`sage.structure.sage_object.SageObject._singular_`
to declare the type of ``self`` to be ``'poly'``.
Needed because even with ``setring``, constant polynomials are not considered
polynomials of the current ring.

TESTS::

sage: R.<x,y> = Zmod(5)[]
sage: a = singular(R(2)) + singular(R(2)) + singular(R(1)); a
0
sage: a == singular(R(0))
True
"""
if singular is None:
from sage.interfaces.singular import singular
return singular(self._singular_init_(singular), type='poly')

def sub_m_mul_q(self, MPolynomial_libsingular m, MPolynomial_libsingular q):
"""
Return ``self - m*q``, where ``m`` must be a monomial and
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