# Question:Division by zero

## Question:Division by zero

Maple
I got an interesting error message
```assume(x>0);
assume(lambda>=0);

f:=(x,lambda)->2/(1+lambda)*1/( 1/(x+lambda)+1/(1+lambda));

2
(x, lambda) -> --------------------------------------
/    1            1     \
(1 + lambda) |---------- + ----------|
\x + lambda   1 + lambda/

ftilde:=(x,lambda)->1/2*(x+1-(x-1)^2*f(0,lambda)/f(x,lambda));

2
1     1   (x - 1)  f(0, lambda)
(x, lambda) -> - x + - - ---------------------
2     2      2 f(x, lambda)

ftilde(0,lambda);

0

simpleftilde:=(x,lambda)->simplify(ftilde(x,lambda));

(x, lambda) -> simplify(ftilde(x, lambda))
simpleftilde(x,lambda);

/                                     2                 2           2\
x \-x - 4 lambda - 3 lambda x - 6 lambda  - 1 + 2 x lambda  + lambda x /
- ------------------------------------------------------------------------
2 (1 + 2 lambda) (x + lambda)
simpleftilde(x,0);

Error, (in f) numeric exception: division by zero
f(x,0);

2
-----
1
- + 1
x
```
Where is the problem with division by zero? Sandor
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