Description: Closure law for negative of reals. (Contributed by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | renegcld.1 | |
|
Assertion | renegcld | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | renegcld.1 | |
|
2 | renegcl | |
|
3 | 1 2 | syl | |