On Saturday, August 30, 2014 1:21:36 PM UTC+2, Sergey Kirpichev wrote:
>
>
> I don't think there's a big issue with this, because already 
>> `ask(Q.real(x))` and `x.is_real` are different. My proposal is to have the 
>> first call the second but not the other way around.
>>
>
> That's impossible now.  Simple example: x.is_real = Q.extended_real(x), 
> not Q.real.
>

SymPy is still version zero, some API breaks may be acceptable. Otherwise 
on the next release (0.7.6), one could add a warning that x.is_real will 
undergo some logical modifications in version 0.7.7. After this, make the 
old and new assumptions equivalent in the master branch as soon as 0.7.6 is 
out.

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