Sigma Notation
Issue #1179
new
I realize there is already a sum function, but that requires you to put in every single value, and is not great for the more complex equations that require a Sigma Notation. If the function could be something like this: sigma(n, m, fn) then that would be fine. It would also be dandy if we were allowed to put in the current iteration in the equation, something like sigma(1, 10, 2+n) (this should equal 75).
