Description: The topology of the extended reals is Hausdorff. (Contributed by Thierry Arnoux, 24-Mar-2017)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | xrhaus | |- ( ordTop ` <_ ) e. Haus |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | letsr | |- <_ e. TosetRel |
|
| 2 | ordthaus | |- ( <_ e. TosetRel -> ( ordTop ` <_ ) e. Haus ) |
|
| 3 | 1 2 | ax-mp | |- ( ordTop ` <_ ) e. Haus |