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Mirrors > Home > MPE Home > Th. List > nnel | Structured version Visualization version GIF version |
Description: Negation of negated membership, analogous to nne 2798. (Contributed by Alexander van der Vekens, 18-Jan-2018.) (Proof shortened by Wolf Lammen, 25-Nov-2019.) |
Ref | Expression |
---|---|
nnel | ⊢ (¬ 𝐴 ∉ 𝐵 ↔ 𝐴 ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-nel 2898 | . . 3 ⊢ (𝐴 ∉ 𝐵 ↔ ¬ 𝐴 ∈ 𝐵) | |
2 | 1 | bicomi 214 | . 2 ⊢ (¬ 𝐴 ∈ 𝐵 ↔ 𝐴 ∉ 𝐵) |
3 | 2 | con1bii 346 | 1 ⊢ (¬ 𝐴 ∉ 𝐵 ↔ 𝐴 ∈ 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 196 ∈ wcel 1990 ∉ wnel 2897 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 197 df-nel 2898 |
This theorem is referenced by: raldifsnb 4325 mpt2xopynvov0g 7340 0mnnnnn0 11325 ssnn0fi 12784 rabssnn0fi 12785 hashnfinnn0 13152 lcmfunsnlem2lem2 15352 finsumvtxdg2ssteplem1 26441 pthdivtx 26625 wwlksnndef 26800 wwlksnfi 26801 clwwlksnndef 26890 frgrwopreglem4a 27174 poimirlem26 33435 lswn0 41380 prminf2 41500 |
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