Hi everyone.

Is there any method using which i can find the domain of a function in 
sympy ?

Ex. if can get something like this
>> real_domain( log(x), x )
Interval(0, oo, left_open=True)

Or even if there is no such function. Then is there any method i can get 
whether a particular function is real in an Interval.
For ex.
>>>  IsReal( log(x), Interval(1, 5))
True

It will be helpful for me. Thank you.

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