For those that haven't used Mma, the uppercase/lowercase convention helps a lot here. Built in functions start with uppercase letters, like LinearProgramming.

For those that haven't used Mma, the uppercase/lowercase convention helps a lot here. Built in functions start with uppercase letters, like LinearProgramming. You should name your functions with a lowercase letter. So the namespace is messy, but you're never going to accidentally collide with a built in name.