# Question:Is this a bug and has it been fixed?

## Question:Is this a bug and has it been fixed?

Maple

Hi:

I have justdiscovered that the following "simplify" command gives the wrong answer on Maple 11. Could someone please check to determine if Maple 14 does any better?

> S1:=Sum(1/GAMMA(j+1)/GAMMA(2-j)*GAMMA(1+a-c+j)*GAMMA(1+a-b+j)/GAMMA(a-
> 1+j)*GAMMA(-2+b+c-j+n-a),j = 0 .. 1);
> Ans1:=simplify(S1);

1
-----
\
S1 :=   )   GAMMA(1 + a - c + j) GAMMA(1 + a - b + j)
/
-----
j = 0

GAMMA(-2 + b + c - j + n - a)/(GAMMA(j + 1) GAMMA(2 - j)

GAMMA(a - 1 + j))

Ans1 := 0

> (subs(Sum=sum,S1));
> Ans2:=simplify(%);

1
-----
\
)   GAMMA(1 + a - c + j) GAMMA(1 + a - b + j)
/
-----
j = 0

GAMMA(-2 + b + c - j + n - a)/(GAMMA(j + 1) GAMMA(2 - j)

GAMMA(a - 1 + j))

Ans2 := (a n + 4 - 2 b - 2 c - n + c b) GAMMA(1 + a - c)

GAMMA(1 + a - b) GAMMA(-3 + b + c + n - a)/GAMMA(a)

> test:=evalf(subs(a=-3.5,b=-.77,c=.0456,n=1,[S1,Ans1,Ans2]));

test := [-9.696727641, 0., -9.696727639]

>

PS: Why can't I copy directly to this forum  from my Maple11 worksheet without having to converting it to maple text?

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