[sage-devel] Re: bad binomial sum

2010-01-16 Thread andrejv
> andrejv wrote: > > On Jan 10, 6:15 pm, Harald Schilly wrote: > > > Hi, I got this from the report a problem link: > > > > Typing (in the inotebook) > > > > var('t,k,i') > > > sum(binomial(i+t,t),i,0,k) > > > > results in > > > > binomial(k + t + 1, t + 1) - 1 > > > > which is false, the well-kn

Re: [sage-devel] Re: bad binomial sum

2010-01-16 Thread Burcin Erocal
Hi Andrej, On Mon, 11 Jan 2010 08:08:52 -0800 (PST) andrejv wrote: > On Jan 10, 6:15 pm, Harald Schilly wrote: > > Hi, I got this from the report a problem link: > > > > Typing (in the inotebook) > > > > var('t,k,i') > > sum(binomial(i+t,t),i,0,k) > > > > results in > > > > binomial(k + t + 1,

[sage-devel] Re: bad binomial sum

2010-01-11 Thread andrejv
On Jan 10, 6:15 pm, Harald Schilly wrote: > Hi, I got this from the report a problem link: > > Typing (in the inotebook) > > var('t,k,i') > sum(binomial(i+t,t),i,0,k) > > results in > > binomial(k + t + 1, t + 1) - 1 > > which is false, the well-known answer is binomial(k + t + 1, t + 1) There is