Could someone who knows orders in number fields verify that they are  
not at the moment unique parents and, if that is the desired  
behaviour, explain why?  I have a coercion error in ell_number_field  
based on this.

{{{
sage: K.<a> = NumberField(x^2 + 1, 'a')
sage: O1 = K.order([a, 1])
sage: O2 = K.order([a, 1, 1])
sage: O1 == O2
True
sage: O1 is O2
False
sage: O1.gens()
(1, a)
sage: O2.gens()
(1, a)
}}}

Nick

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