| Gimlet rose to greet her, with anxiety showing in every one of the enumerable lines on his battered old face. |
| Any recursively enumerable set which is also co-recursively enumerable is a decidable set. |
| Then A2 is a complete computably enumerable subset of true second-order arithmetic. |
| All enumerable sets are equivalent to each other, but not to any finite set. |
| The paper investigated sets of indices of partial recursive functions and of recursively enumerable sets. |
| They are enumerable but naming a few of them as a sample of them seems timely. |
