#15304: is_polynomial() returns wrong results
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   Reporter:  defeo      |            Owner:
       Type:  defect     |           Status:  new
   Priority:  minor      |        Milestone:  sage-5.13
  Component:  symbolics  |         Keywords:  polynomial symbolic
  Merged in:             |          Authors:
  Reviewers:             |  Report Upstream:  N/A
Work issues:             |           Branch:
     Commit:             |     Dependencies:
   Stopgaps:             |
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 It is not the first time `is_polynomial()` behaves wrong, see #11352.

 Here's the bug:

 {{{
 sage: var('x,y')
 (x, y)
 sage: (y/x).is_polynomial(x)
 True
 }}}

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Ticket URL: <http://trac.sagemath.org/ticket/15304>
Sage <http://www.sagemath.org>
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