Hi,
I created the ticket 7119 for this bug, and attached a patch.
Kwankyu
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Hi,
this bug results from the class PolyDict in sage/rings/polynomial/
polydict.pyx rests upon "zero" optional parameter, which defaults to
integer 0, to decide the characteristic of the parent ring when its
object is printed. On the other hand, f.lt() does not set the zero
parameter in sage/ring