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| Mirrors > Home > ILE Home > Th. List > ralnex | GIF version | ||
| Description: Relationship between restricted universal and existential quantifiers. (Contributed by NM, 21-Jan-1997.) |
| Ref | Expression |
|---|---|
| ralnex | ⊢ (∀𝑥 ∈ 𝐴 ¬ 𝜑 ↔ ¬ ∃𝑥 ∈ 𝐴 𝜑) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ral 2516 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ¬ 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → ¬ 𝜑)) | |
| 2 | alinexa 1652 | . . 3 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → ¬ 𝜑) ↔ ¬ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 3 | df-rex 2517 | . . 3 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 4 | 2, 3 | xchbinxr 690 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → ¬ 𝜑) ↔ ¬ ∃𝑥 ∈ 𝐴 𝜑) |
| 5 | 1, 4 | bitri 184 | 1 ⊢ (∀𝑥 ∈ 𝐴 ¬ 𝜑 ↔ ¬ ∃𝑥 ∈ 𝐴 𝜑) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∀wal 1396 ∃wex 1541 ∈ wcel 2202 ∀wral 2511 ∃wrex 2512 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-5 1496 ax-gen 1498 ax-ie2 1543 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-ral 2516 df-rex 2517 |
| This theorem is referenced by: nnral 2523 rexalim 2526 ralinexa 2560 nrex 2625 nrexdv 2626 ralnex2 2673 r19.30dc 2681 uni0b 3923 iindif2m 4043 f0rn0 5540 supmoti 7235 fodjuomnilemdc 7386 ismkvnex 7397 nninfwlpoimlemginf 7418 suprnubex 9175 icc0r 10205 ioo0 10565 ico0 10567 ioc0 10568 prmind2 12755 sqrt2irr 12797 umgrnloop0 16041 vtxd0nedgbfi 16223 1hevtxdg0fi 16231 nconstwlpolem 16781 |
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