#4667: [with patch, needs work] quadratic twists for p-adic L-functions
---------------------------+------------------------------------------------
 Reporter:  wuthrich       |       Owner:  was                                
     Type:  enhancement    |      Status:  new                                
 Priority:  minor          |   Milestone:  sage-3.4.2                         
Component:  number theory  |    Keywords:  padic l-functions, quadratic twists
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Comment(by wuthrich):

 Uiuiui, I am sorry that was quite bad. I did not merge well
 ell_rational_field.

 I add another patch that should be applied after the previous.
 It looks to me as if everything passes now. Except

 {{{
 File
 "/maths/staff/pmzcw/Desktop/sage/twists/elliptic_curves/ell_rational_field.py",
 line 3096:
     sage: E.cremona_label()
 Expected:
     Traceback (most recent call last):
     ...
     RuntimeError: Cremona label not known for Elliptic Curve defined by
 y^2 + x*y + 3*y = x^3 + 2*x^2 + 4*x + 5 over Rational Field.
 Got:
     '10351a1'
 }}}

 but this is due to having installed the optional package. I still don't
 know if there is a way to include a test only if the optional package is
 NOT there. But anyway that is not in my code.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4667#comment:15>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of 
Reinventing the Wheel

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