Description: Orthogonal complement of the empty set. (Contributed by NM, 31-Oct-2000) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | chocnul |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ral0 | ||
2 | 0ss | ||
3 | ocel | ||
4 | 2 3 | ax-mp | |
5 | 1 4 | mpbiran2 | |
6 | 5 | eqriv |