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| Mirrors > Home > MPE Home > Th. List > Mathboxes > dfeldisj4 | Structured version Visualization version GIF version | ||
| Description: Alternate definition of the disjoint elementhood predicate. (Contributed by Peter Mazsa, 19-Sep-2021.) |
| Ref | Expression |
|---|---|
| dfeldisj4 | ⊢ ( ElDisj 𝐴 ↔ ∀𝑥∃*𝑢 ∈ 𝐴 𝑥 ∈ 𝑢) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-eldisj 39037 | . 2 ⊢ ( ElDisj 𝐴 ↔ Disj (◡ E ↾ 𝐴)) | |
| 2 | relres 5972 | . . 3 ⊢ Rel (◡ E ↾ 𝐴) | |
| 3 | dfdisjALTV4 39046 | . . 3 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ (∀𝑥∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥 ∧ Rel (◡ E ↾ 𝐴))) | |
| 4 | 2, 3 | mpbiran2 711 | . 2 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ ∀𝑥∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥) |
| 5 | brcnvepres 38517 | . . . . . 6 ⊢ ((𝑢 ∈ V ∧ 𝑥 ∈ V) → (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢))) | |
| 6 | 5 | el2v 3449 | . . . . 5 ⊢ (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)) |
| 7 | 6 | mobii 2549 | . . . 4 ⊢ (∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥 ↔ ∃*𝑢(𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)) |
| 8 | df-rmo 3352 | . . . 4 ⊢ (∃*𝑢 ∈ 𝐴 𝑥 ∈ 𝑢 ↔ ∃*𝑢(𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)) | |
| 9 | 7, 8 | bitr4i 278 | . . 3 ⊢ (∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥 ↔ ∃*𝑢 ∈ 𝐴 𝑥 ∈ 𝑢) |
| 10 | 9 | albii 1821 | . 2 ⊢ (∀𝑥∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥 ↔ ∀𝑥∃*𝑢 ∈ 𝐴 𝑥 ∈ 𝑢) |
| 11 | 1, 4, 10 | 3bitri 297 | 1 ⊢ ( ElDisj 𝐴 ↔ ∀𝑥∃*𝑢 ∈ 𝐴 𝑥 ∈ 𝑢) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 ∀wal 1540 ∈ wcel 2114 ∃*wmo 2538 ∃*wrmo 3351 Vcvv 3442 class class class wbr 5100 E cep 5531 ◡ccnv 5631 ↾ cres 5634 Rel wrel 5637 Disj wdisjALTV 38464 ElDisj weldisj 38466 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-pr 5379 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rmo 3352 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-br 5101 df-opab 5163 df-id 5527 df-eprel 5532 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-coss 38746 df-cnvrefrel 38852 df-disjALTV 39035 df-eldisj 39037 |
| This theorem is referenced by: dfeldisj5 39058 eldisjs7 39186 |
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