| Answer | Crossword Clue |
|---|---|
| ALEPH | ...-null (number of positive integers) |
| sequence | set of elements ordered so that they can be labeled with the positive integers |
| enumerable | Able to be counted by one-to-one correspondence with the set of all positive integers |
| factorial | the product of a given positive integer multiplied by all lesser positive integers: The quantity four factorial (4!) = 4 · 3 · 2 · 1 = 24. Symbol:n!, where n is the given integer |
