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Mathbox for Peter Mazsa |
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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 38689 | . 2 ⊢ ( ElDisj 𝐴 ↔ Disj (◡ E ↾ 𝐴)) | |
2 | relres 6026 | . . 3 ⊢ Rel (◡ E ↾ 𝐴) | |
3 | dfdisjALTV4 38698 | . . 3 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ (∀𝑥∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥 ∧ Rel (◡ E ↾ 𝐴))) | |
4 | 2, 3 | mpbiran2 710 | . 2 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ ∀𝑥∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥) |
5 | brcnvepres 38249 | . . . . . 6 ⊢ ((𝑢 ∈ V ∧ 𝑥 ∈ V) → (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢))) | |
6 | 5 | el2v 3485 | . . . . 5 ⊢ (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)) |
7 | 6 | mobii 2546 | . . . 4 ⊢ (∃*𝑢 𝑢(◡ E ↾ 𝐴)𝑥 ↔ ∃*𝑢(𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)) |
8 | df-rmo 3378 | . . . 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 1816 | . 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 1535 ∈ wcel 2106 ∃*wmo 2536 ∃*wrmo 3377 Vcvv 3478 class class class wbr 5148 E cep 5588 ◡ccnv 5688 ↾ cres 5691 Rel wrel 5694 Disj wdisjALTV 38196 ElDisj weldisj 38198 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pr 5438 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rmo 3378 df-rab 3434 df-v 3480 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-sn 4632 df-pr 4634 df-op 4638 df-br 5149 df-opab 5211 df-id 5583 df-eprel 5589 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-coss 38393 df-cnvrefrel 38509 df-disjALTV 38687 df-eldisj 38689 |
This theorem is referenced by: dfeldisj5 38703 |
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