Description: A class is not an element of and equal to a class at the same time. Variant of elneq analogously to elnotel and en2lp . (Proposed by BJ, 18-Jun-2022.) (Contributed by AV, 18-Jun-2022)
Ref | Expression | ||
---|---|---|---|
Assertion | nelaneq |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elneq | ||
2 | orc | ||
3 | neneq | ||
4 | 3 | olcd | |
5 | 2 4 | ja | |
6 | 1 5 | ax-mp | |
7 | ianor | ||
8 | 6 7 | mpbir |