id summary reporter owner description type status priority milestone component resolution keywords cc merged author reviewer upstream work_issues branch commit dependencies stopgaps
10682 sum fails with lower bound != 0 or 1 fmaltey burcin "I test
{{{
sage: var ('n,k')
sage: sum (binomial(n,k)*k2, k, 0, n) # is right
sage: sum (binomial(n,k)*k2, k, 1, n) # is right n(n+1)2^(n-2)
sage: sum (binomial(n,k)*k2, k, 2, n) # is false : I get 0
}}}" defect new major sage-5.0 symbolics N/A