Description: The topology of the extended reals. (Contributed by Mario Carneiro, 3-Sep-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | letop | |- ( ordTop ` <_ ) e. Top |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | letopon | |- ( ordTop ` <_ ) e. ( TopOn ` RR* ) |
|
2 | 1 | topontopi | |- ( ordTop ` <_ ) e. Top |