Description: The "less than or equal to" relation in the extended real numbers. (Contributed by Thierry Arnoux, 14-Mar-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | xrge0le | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ovex | |
|
2 | eqid | |
|
3 | xrsle | |
|
4 | 2 3 | ressle | |
5 | 1 4 | ax-mp | |