Two bugs in Rev 6975
12-30-2014, 09:42 PM (This post was last modified: 12-30-2014 10:30 PM by Snorre.)
Post: #7
 Snorre Member Posts: 101 Joined: Dec 2013
RE: Two bugs in Rev 6975
So your first problem remains. (How did the iteration variable pop up to the result?)
I'm not sure if it is related to: I always try to avoid to calculate differentials (as in taylor series expansion) of sums -- e.g. diff(sum(x/k²+1,k=1..∞),x) vs. sum(diff(x/k²+1,x),k=1..∞), where both should be equal, but due to evaluation order from inner to outer the first expression results in eyebrow-lifting ∂∞/∂x=0.
Maybe you should better do a sum(taylor(x^(c+1),c=5),x=1..b) which is also a taylor polynom, but won't help much as without a concrete b the sum cannot be further simplified.
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 Messages In This Thread Two bugs in Rev 6975 - Peter Van Roy - 12-29-2014, 07:45 PM RE: Two bugs in Rev 6975 - Mark Hardman - 12-29-2014, 08:38 PM RE: Two bugs in Rev 6975 - Peter Van Roy - 12-30-2014, 10:56 AM RE: Two bugs in Rev 6975 - Marcel - 12-30-2014, 03:31 PM RE: Two bugs in Rev 6975 - Snorre - 12-30-2014, 07:52 PM RE: Two bugs in Rev 6975 - Peter Van Roy - 12-30-2014, 08:50 PM RE: Two bugs in Rev 6975 - Snorre - 12-30-2014 09:42 PM

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