#2775 powerseries of some log expressions

None
closed
nobody
None
5
2014-08-25
2014-07-01
Barton Willis
No

Wrong (incorrect for x --> 0, for example)

(%i1) powerseries(log(2-x),x,0);
(%o1) log(-1)-sum((2^(-i1-1)*x^(i1+1))/(i1+1),i1,0,inf)

Discussion

  • This should be fixed by [71578f] that I just pushed. It was caused by sp1log expanding log(2-x) as log(2-x) = log(-(x-2)) = log(-1) + log(x-2). Oops!

     

    Related

    Commit: [71578f]

    • status: open --> closed