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| Mirrors > Home > MPE Home > Th. List > Mathboxes > axunprim | Structured version Visualization version GIF version | ||
| Description: ax-un 7685 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 10517 | . 2 ⊢ ∃𝑥∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) | |
| 2 | df-an 397 | . . . . . . . 8 ⊢ ((𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) ↔ ¬ (𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) | |
| 3 | 2 | exbii 1855 | . . . . . . 7 ⊢ (∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) ↔ ∃𝑥 ¬ (𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) |
| 4 | exnal 1834 | . . . . . . 7 ⊢ (∃𝑥 ¬ (𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) ↔ ¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) | |
| 5 | 3, 4 | bitri 276 | . . . . . 6 ⊢ (∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) ↔ ¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧)) |
| 6 | 5 | imbi1i 350 | . . . . 5 ⊢ ((∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ (¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 7 | 6 | albii 1826 | . . . 4 ⊢ (∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 8 | 7 | exbii 1855 | . . 3 ⊢ (∃𝑥∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ∃𝑥∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 9 | df-ex 1787 | . . 3 ⊢ (∃𝑥∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) | |
| 10 | 8, 9 | bitri 276 | . 2 ⊢ (∃𝑥∀𝑦(∃𝑥(𝑦 ∈ 𝑥 ∧ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) ↔ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥)) |
| 11 | 1, 10 | mpbi 231 | 1 ⊢ ¬ ∀𝑥 ¬ ∀𝑦(¬ ∀𝑥(𝑦 ∈ 𝑥 → ¬ 𝑥 ∈ 𝑧) → 𝑦 ∈ 𝑥) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∀wal 1545 ∃wex 1786 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-13 2380 ax-ext 2712 ax-sep 5225 ax-pr 5369 ax-un 7685 ax-reg 9504 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-ral 3055 df-rex 3065 df-rab 3393 df-v 3434 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-br 5080 df-opab 5142 df-eprel 5525 df-fr 5578 |
| This theorem is referenced by: (None) |
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