Description: Well-ordering of a singleton. (Contributed by Mario Carneiro, 28-Dec-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | wesn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | frsn | |
|
2 | sosn | |
|
3 | 1 2 | anbi12d | |
4 | df-we | |
|
5 | pm4.24 | |
|
6 | 3 4 5 | 3bitr4g | |