On Wednesday, September 23, 2015 at 11:14:32 PM UTC+2, William wrote:

>   ex.is_zero(simplify=False) 
>   ex.is_zero(simplify=True) 


Most consistent. Why didn't I think of this. 

On Wednesday, September 23, 2015 at 10:08:52 PM UTC+2, Michael Orlitzky 
wrote:
>
> Doesn't `bool(x == y)` already try to simplify `x - y` to zero? 
>
 
At the moment yes. But it is also invoked when people want to compare
objects and write if (ex!=0). See example confusion at
http://trac.sagemath.org/ticket/18979

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