| A | B |
|---|
| sequence | ordered list of numbers |
| term | each number in a sequence |
| a1 | first number in a sequence |
| an | nth number in a sequence |
| finite | a definite number of terms |
| infinite | an unlimited number of terms |
| recursive formula | requires the previous term |
| explicit, or closed form formula | does not require the previous term |
| common difference | amount added or subtracted to find the next term |
| arithmetic | sequence with a common difference |
| domain of a sequence | whole numbers: 1, 2, 3... |
| common difference of 2, 5, 8... | 3 |
| first term of 2, 5, 8... | 2 |
