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Mirrors > Home > MPE Home > Th. List > Mathboxes > distel | Structured version Visualization version GIF version |
Description: Distinctors in terms of membership. (NOTE: this only works with relations where we can prove el 4988 and elirrv 8658.) (Contributed by Scott Fenton, 15-Dec-2010.) |
Ref | Expression |
---|---|
distel | ⊢ (¬ ∀𝑦 𝑦 = 𝑥 ↔ ¬ ∀𝑦 ¬ 𝑥 ∈ 𝑦) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | el 4988 | . . 3 ⊢ ∃𝑧 𝑥 ∈ 𝑧 | |
2 | df-ex 1846 | . . . 4 ⊢ (∃𝑧 𝑥 ∈ 𝑧 ↔ ¬ ∀𝑧 ¬ 𝑥 ∈ 𝑧) | |
3 | nfnae 2452 | . . . . . 6 ⊢ Ⅎ𝑦 ¬ ∀𝑦 𝑦 = 𝑥 | |
4 | dveel1 2499 | . . . . . . . 8 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → (𝑥 ∈ 𝑧 → ∀𝑦 𝑥 ∈ 𝑧)) | |
5 | 3, 4 | nf5d 2257 | . . . . . . 7 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → Ⅎ𝑦 𝑥 ∈ 𝑧) |
6 | 5 | nfnd 1926 | . . . . . 6 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → Ⅎ𝑦 ¬ 𝑥 ∈ 𝑧) |
7 | elequ2 2145 | . . . . . . . 8 ⊢ (𝑧 = 𝑦 → (𝑥 ∈ 𝑧 ↔ 𝑥 ∈ 𝑦)) | |
8 | 7 | notbid 307 | . . . . . . 7 ⊢ (𝑧 = 𝑦 → (¬ 𝑥 ∈ 𝑧 ↔ ¬ 𝑥 ∈ 𝑦)) |
9 | 8 | a1i 11 | . . . . . 6 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → (𝑧 = 𝑦 → (¬ 𝑥 ∈ 𝑧 ↔ ¬ 𝑥 ∈ 𝑦))) |
10 | 3, 6, 9 | cbvald 2414 | . . . . 5 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → (∀𝑧 ¬ 𝑥 ∈ 𝑧 ↔ ∀𝑦 ¬ 𝑥 ∈ 𝑦)) |
11 | 10 | notbid 307 | . . . 4 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → (¬ ∀𝑧 ¬ 𝑥 ∈ 𝑧 ↔ ¬ ∀𝑦 ¬ 𝑥 ∈ 𝑦)) |
12 | 2, 11 | syl5bb 272 | . . 3 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → (∃𝑧 𝑥 ∈ 𝑧 ↔ ¬ ∀𝑦 ¬ 𝑥 ∈ 𝑦)) |
13 | 1, 12 | mpbii 223 | . 2 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 → ¬ ∀𝑦 ¬ 𝑥 ∈ 𝑦) |
14 | elirrv 8658 | . . . . 5 ⊢ ¬ 𝑦 ∈ 𝑦 | |
15 | elequ1 2138 | . . . . 5 ⊢ (𝑦 = 𝑥 → (𝑦 ∈ 𝑦 ↔ 𝑥 ∈ 𝑦)) | |
16 | 14, 15 | mtbii 315 | . . . 4 ⊢ (𝑦 = 𝑥 → ¬ 𝑥 ∈ 𝑦) |
17 | 16 | alimi 1880 | . . 3 ⊢ (∀𝑦 𝑦 = 𝑥 → ∀𝑦 ¬ 𝑥 ∈ 𝑦) |
18 | 17 | con3i 150 | . 2 ⊢ (¬ ∀𝑦 ¬ 𝑥 ∈ 𝑦 → ¬ ∀𝑦 𝑦 = 𝑥) |
19 | 13, 18 | impbii 199 | 1 ⊢ (¬ ∀𝑦 𝑦 = 𝑥 ↔ ¬ ∀𝑦 ¬ 𝑥 ∈ 𝑦) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 196 ∀wal 1622 ∃wex 1845 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1863 ax-4 1878 ax-5 1980 ax-6 2046 ax-7 2082 ax-8 2133 ax-9 2140 ax-10 2160 ax-11 2175 ax-12 2188 ax-13 2383 ax-ext 2732 ax-sep 4925 ax-nul 4933 ax-pow 4984 ax-pr 5047 ax-reg 8654 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-tru 1627 df-ex 1846 df-nf 1851 df-sb 2039 df-clab 2739 df-cleq 2745 df-clel 2748 df-nfc 2883 df-ral 3047 df-rex 3048 df-v 3334 df-dif 3710 df-un 3712 df-nul 4051 df-sn 4314 df-pr 4316 |
This theorem is referenced by: (None) |
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