this is related to
http://groups.google.com/group/sage-devel/browse_thread/thread/9f941378a95c0191/8a7b060b45f7fc99?lnk=gst&q=bug+conjugate#8a7b060b45f7fc99

It seems that conjugate( sqrt(-3) ) now evaluates to itself, which is
better than the erroneous sqrt(-3). However we still have:

sage: z= I * sqrt(-3)
sage: z.conjugate()
-I*sqrt(-3)

... which is just wrong.

regards
Pierre

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