Thank you for that! I didn't know you could bring up the mail list that 
way. But that's very promising I think!

On Thursday, January 28, 2016 at 8:06:16 AM UTC-6, slelievre wrote:
>
>
>
> Le mercredi 27 janvier 2016 05:23:45 UTC+1, saad khalid a écrit :
>>
>> I asked the list and here was the response I got. Personally, I think 
>> that it would be a good idea, but I don't know how to implement it myself.
>>
>> "The besselexpand is an option variable in maxima core (part of the 
>> bessel function package) and simplify_sum is a share package. In general I 
>> think that share packages should not modify core options when it is not 
>> necessary. And I think functions in general should not change option 
>> variables so that the user can't control them. So the reason why 
>> simplify_sum doesn't change besselexpand to true is not because I know of 
>> some problems with it, but because I try to avoid such behaviour of 
>> functions (I knew that simplify_sum would return nicer results with 
>> besselexpand:true when I wrote that part of simplify_sum).
>>
>> But maybe this is a situation in which changing global option variables 
>> should be allowed from a function.
>>
>> HTH,
>> Andrej"
>>
>
> Just to add a pointer to that discussion on maxima-discuss:
> - at gmane:
> http://thread.gmane.org/gmane.comp.mathematics.maxima.general/52224 
> - at sourceforge
>
> http://sourceforge.net/p/maxima/mailman/maxima-discuss/thread/CAC05q1u%3D8gJRvBC6ucSRrHstsQqnse2pvV5Xs239qWdNyr1-Ow%40mail.gmail.com/#msg34796315
>
>

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