Golam Mortuza Hossain wrote:
> Thanks Minh and Robert,
> 
> On Mar 18, 8:28 pm, Robert Bradshaw <rober...@math.washington.edu>
> wrote:
>> This is because (f)(x) calls f at x rather than performing  
>> multiplication. It is for exactly this kind of reason that we're  
>> deprecating the "call without explicit arguments" behavior.
> 
> OK, now I understand the underlying reason for the weird behaviour.
> 
> Is there a way in Sage, to turn-on something like "Strict Mode" where
> Sage will raise an error or at least a warning for such situation (
> "call without explicit arguments") ?
> 
> To me, it seems to be a really serious issue as it affects the
> reliability of
> of the answers from Sage (specially for a long symbolic calculation).
> 


That's what Robert is saying.  There is a patch that is undergoing 
revision right now that deprecates this behavior.  That means that for 
the next little while, there will be a warning anytime this happens. 
Eventually, this functionality will be removed.

Jason


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