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Mirrors > Home > ILE Home > Th. List > nrex | GIF version |
Description: Inference adding restricted existential quantifier to negated wff. (Contributed by NM, 16-Oct-2003.) |
Ref | Expression |
---|---|
nrex.1 | ⊢ (𝑥 ∈ 𝐴 → ¬ 𝜓) |
Ref | Expression |
---|---|
nrex | ⊢ ¬ ∃𝑥 ∈ 𝐴 𝜓 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nrex.1 | . . 3 ⊢ (𝑥 ∈ 𝐴 → ¬ 𝜓) | |
2 | 1 | rgen 2374 | . 2 ⊢ ∀𝑥 ∈ 𝐴 ¬ 𝜓 |
3 | ralnex 2316 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ¬ 𝜓 ↔ ¬ ∃𝑥 ∈ 𝐴 𝜓) | |
4 | 2, 3 | mpbi 133 | 1 ⊢ ¬ ∃𝑥 ∈ 𝐴 𝜓 |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 1393 ∀wral 2306 ∃wrex 2307 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-5 1336 ax-gen 1338 ax-ie2 1383 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-fal 1249 df-ral 2311 df-rex 2312 |
This theorem is referenced by: rex0 3238 iun0 3713 frec0g 5983 nominpos 8162 sqrt2irr 9878 |
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