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| Mirrors > Home > MPE Home > Th. List > Mathboxes > scotteld | Structured version Visualization version GIF version | ||
| Description: The Scott operation sends inhabited classes to inhabited sets. (Contributed by Rohan Ridenour, 11-Aug-2023.) |
| Ref | Expression |
|---|---|
| scotteld.1 | ⊢ (𝜑 → ∃𝑥 𝑥 ∈ 𝐴) |
| Ref | Expression |
|---|---|
| scotteld | ⊢ (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | scotteld.1 | . . . . . 6 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ 𝐴) | |
| 2 | n0 4319 | . . . . . 6 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴) | |
| 3 | 1, 2 | sylibr 234 | . . . . 5 ⊢ (𝜑 → 𝐴 ≠ ∅) |
| 4 | 3 | neneqd 2931 | . . . 4 ⊢ (𝜑 → ¬ 𝐴 = ∅) |
| 5 | scott0 9846 | . . . . 5 ⊢ (𝐴 = ∅ ↔ {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅) | |
| 6 | df-scott 44232 | . . . . . 6 ⊢ Scott 𝐴 = {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} | |
| 7 | 6 | eqeq1i 2735 | . . . . 5 ⊢ (Scott 𝐴 = ∅ ↔ {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅) |
| 8 | 5, 7 | bitr4i 278 | . . . 4 ⊢ (𝐴 = ∅ ↔ Scott 𝐴 = ∅) |
| 9 | 4, 8 | sylnib 328 | . . 3 ⊢ (𝜑 → ¬ Scott 𝐴 = ∅) |
| 10 | 9 | neqned 2933 | . 2 ⊢ (𝜑 → Scott 𝐴 ≠ ∅) |
| 11 | n0 4319 | . 2 ⊢ (Scott 𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ Scott 𝐴) | |
| 12 | 10, 11 | sylib 218 | 1 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1540 ∃wex 1779 ∈ wcel 2109 ≠ wne 2926 ∀wral 3045 {crab 3408 ⊆ wss 3917 ∅c0 4299 ‘cfv 6514 rankcrnk 9723 Scott cscott 44231 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-int 4914 df-iun 4960 df-iin 4961 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-ov 7393 df-om 7846 df-2nd 7972 df-frecs 8263 df-wrecs 8294 df-recs 8343 df-rdg 8381 df-r1 9724 df-rank 9725 df-scott 44232 |
| This theorem is referenced by: cpcolld 44254 |
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