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Thanks for the answer I understand that the terms of the series k>=50 have insignificant contributions to the sum. On the other hand I didn't succeed in reproducing the series giving at the beginning for fixed j. Will you please give some hints...
Will you please make your answer more explicite ( where your answer comes from?) as the instruction you gave leads to a still an appropriate answer ( the first term contient Gamma[z, 0]) In[85]:= Series[-(-1)^(n +...
Why copy a notebook as Latex doesn't work properly at overleaf online Latex program ( Tex version 2021). Does it work in other Latex programs?
Ok, Bye.
Thanks