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
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