Description: Proper classes are not related via any relation. (Contributed by AV, 29-Oct-2021)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nprrel12.1 | |
|
Assertion | nprrel12 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nprrel12.1 | |
|
2 | 1 | brrelex12i | |
3 | 2 | con3i | |