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Mirrors > Home > NFE Home > Th. List > elcompl | GIF version |
Description: Membership in complement. (Contributed by SF, 10-Jan-2015.) |
Ref | Expression |
---|---|
elbool.1 | ⊢ A ∈ V |
Ref | Expression |
---|---|
elcompl | ⊢ (A ∈ ∼ B ↔ ¬ A ∈ B) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elbool.1 | . 2 ⊢ A ∈ V | |
2 | elcomplg 3219 | . 2 ⊢ (A ∈ V → (A ∈ ∼ B ↔ ¬ A ∈ B)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (A ∈ ∼ B ↔ ¬ A ∈ B) |
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