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| Mirrors > Home > MPE Home > Th. List > Mathboxes > axunprim | Structured version Visualization version GIF version | ||
| Description: ax-un 7722 without distinct variable conditions or defined symbols. (Contributed by Scott Fenton, 13-Oct-2010.) |
| Ref | Expression |
|---|---|
| axunprim | ⊢ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | axunnd 10569 | . 2 ⊢ ∃𝑥∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) | |
| 2 | df-an 401 | . . . . . . . 8 ⊢ ((𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) ↔ ¬ (𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) | |
| 3 | 2 | exbii 1871 | . . . . . . 7 ⊢ (∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) ↔ ∃𝑥 ¬ (𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) |
| 4 | exnal 1850 | . . . . . . 7 ⊢ (∃𝑥 ¬ (𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) ↔ ¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) | |
| 5 | 3, 4 | bitri 278 | . . . . . 6 ⊢ (∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) ↔ ¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) |
| 6 | 5 | imbi1i 352 | . . . . 5 ⊢ ((∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ (¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 7 | 6 | albii 1842 | . . . 4 ⊢ (∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 8 | 7 | exbii 1871 | . . 3 ⊢ (∃𝑥∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ∃𝑥∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 9 | df-ex 1803 | . . 3 ⊢ (∃𝑥∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) | |
| 10 | 8, 9 | bitri 278 | . 2 ⊢ (∃𝑥∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 11 | 1, 10 | mpbi 233 | 1 ⊢ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 ∀wal 1561 ∃wex 1802 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-13 2406 ax-ext 2737 ax-sep 5251 ax-pr 5395 ax-un 7722 ax-reg 9542 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-br 5106 df-opab 5168 df-eprel 5552 df-fr 5605 |
| This theorem is referenced by: (None) |
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