Description: A singleton word is a word. (Contributed by Mario Carneiro, 26-Feb-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | s1cli | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ids1 | |
|
2 | fvex | |
|
3 | s1cl | |
|
4 | 2 3 | ax-mp | |
5 | 1 4 | eqeltri | |