From 11:00PM PDT on Friday, July 1 until 5:00AM PDT on Saturday, July 2, the Shmoop engineering elves will be making tweaks and improvements to the site. That means Shmoop will be unavailable for use during that time. Thanks for your patience!
Just like the different lists we threw out in the introduction, there are such things as mathematical lists, too. A sequence is just a list of numbers separated by commas. Like this:
1, 3, 5, 7, 9, …
This is nothing more than a sequence of odd numbers. These lists can be finite (stop at a certain point) or head to infinity and beyond. What makes these lists a little more interesting is that they can be described using things we call rules. We know—it's not a very original name.