sympy/sympy — pull request #1822 by mrocklin (2013-02-22 16:41:50+00:00)
Title: log(Product(...)) -> Sum(log(...))

https://code.google.com/p/sympy/issues/detail?id=3661&thanks=3661&ts=1361550326

```
In [19]: simplify(log(Product(f(i), (i, 1, n))))
Out[19]:
⎛ n ⎞
⎜┬───┬ ⎟
log⎜│ │ f(i)⎟
⎜│ │ ⎟
⎝i = 1 ⎠
```
I would like to see this simplified to
```
In [21]: Sum(log(f(i)), (i, 1, n))
Out[21]:
n
___
╲
╲ log(f(i))
╱
╱
‾‾‾
i = 1
```