Hi! I found the following issue:
sage: R.<u,v,t,T>=PowerSeriesRing(QQ) sage: f=u+O(u,v,t,T)^200 sage: g=f-u sage: g(u^4,v^4,t^4,T^4) --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) /home/tincho/<ipython console> in <module>() /home/tincho/sage-5.3/local/lib/python2.7/site-packages/sage/rings/multi_power_series_ring_element.py in __call__(self, *x, **kwds) 470 else: 471 newprec = self.prec()*min(valn_list) --> 472 return self._value().subs(sub_dict).add_bigoh(newprec) 473 474 def _subs_formal(self,*x,**kwds): /home/tincho/sage-5.3/local/lib/python2.7/site-packages/sage/structure/element.so in sage.structure.element.Element.__getattr__ (sage/structure/element.c:3475)() /home/tincho/sage-5.3/local/lib/python2.7/site-packages/sage/structure/misc.so in sage.structure.misc.getattr_from_other_class (sage/structure/misc.c:1509)() AttributeError: 'sage.rings.rational.Rational' object has no attribute 'add_bigoh' sage: it seems that g = 0 + O(u, v, t, T)^200 cannot be composed with the 4th powers because of the constant remainder it popped out in a big loop involving sums of power series and some of those terms were of the shape g = 0 + O(u, v, t, T)^200 I think it'll be nice that sage treat g = 0 + O(u, v, t, T)^200 any other power series in R kind regards tincho -- You received this message because you are subscribed to the Google Groups "sage-support" group. To post to this group, send email to sage-support@googlegroups.com. To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en.