Axiom Computer Algebra System  Bugs: bug #9216, differentiating sums with respect...
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bug #9216: differentiating sums with respect to a bound is wrong
Submitter:  Martin Rubey <kratt6>  
Submitted:  Fri 04 Jun 2004 08:06:32 AM UTC  
Category:  None  Severity:  3  Normal 
Item Group:  code bug  Status:  transferred 
Privacy:  Public  Assigned to:  None 
Originator Name:  kratt6  Open/Closed:  Open 
Release:  tla from may 2004  Reproducibility:  None 
Fixed Release:  
Error message:  
Example of code trigerring the bug:  f:=operator 'f


Internal cause:  dvdsum in COMBF is mathematically incorrect 
Mon 21 Jun 2004 11:12:28 AM UTC, comment #1: 
Martin Rubey <kratt6> 
Fri 04 Jun 2004 08:06:32 AM UTC, original submission:
(1) f:=operator 'f is nonsense. The problem is in COMBF/dvdsum: dvdsum(l, x) == Although this  d/dx sum_i^x f(i) = f(x)  is a nice try, it is wrong. It seems that the order of magnitude is roughly correct, but that's about it. Unfortunately, I do not know how to return the thing unevaluated, so I cannot fix the bug yet 
Martin Rubey <kratt6> 
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Follow 2 latest changes.
Date  Changed by  Updated Field  Previous Value  =>  Replaced by 

20050622  billpage1  Status  None  transferred  
Example of code trigerring the bug  f:=operator 'f D(sum(f(i),i=a..x),x)  f:=operator 'f D(sum(f(i),i=a..x),x) 
patch #3148