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      Conservation of the noetherianity by perfect transcendental field extensions 

      Fernández Lebrón, María Magdalena; Narváez Macarro, Luis (European Mathematical Society, 2003)
      Let k be a perfect field of characteristic p>0, k(t)per the perfect closure of k(t) and A a k-algebra. We characterize whether the ring A⊗kk(t)per is noetherian when A is the ring of formal power series in n indeterminates over k.
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      Free divisors and duality for D-modules 

      Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (Pleiades, 2002)
      The relationship between D-modules and free divisors has been studied in a general setting by L. Narváez and F.J. Calderón. ...
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      Gröbner δ-bases and Gröbner bases for differential operators 

      Castro Jiménez, Francisco Jesús; Moreno Frías, María Ángeles (Polish Academy of Sciences, Institute of Mathematics, 2002)
      This paper deals with the notion of Gr¨obner δ-base for some rings of linear differential operators by adapting the works ...
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      Ordering pure braid groups on compact, connected surfaces 

      González-Meneses López, Juan (University of California, 2002-04)
      We prove that the pure braid groups on compact, connected, orientable surfaces are bi-orderable, and that the pure braid groups on compact, connected non-orientable surfaces have generalized torsion, thus they are not bi-orderable.
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      Presentations for the monoids of singular braids on closed surfaces 

      González-Meneses López, Juan (Taylor & Francis, 2002)
      We give presentations, in terms of generators and relations, for the monoids SBn(M) of singular braids on closed surfaces. ...
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      Vassiliev invariants for braids on surfaces 

      González-Meneses López, Juan; Paris, Luis (American Mathematical Society, 2004)
      We show that Vassiliev invariants separate braids on a closed oriented surface, and we exhibit an universal Vassiliev ...