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Theorem scotteld 44235
Description: The Scott operation sends inhabited classes to inhabited sets. (Contributed by Rohan Ridenour, 11-Aug-2023.)
Hypothesis
Ref Expression
scotteld.1 (𝜑 → ∃𝑥 𝑥𝐴)
Assertion
Ref Expression
scotteld (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴)
Distinct variable group:   𝑥,𝐴
Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem scotteld
Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 scotteld.1 . . . . . 6 (𝜑 → ∃𝑥 𝑥𝐴)
2 n0 4316 . . . . . 6 (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥𝐴)
31, 2sylibr 234 . . . . 5 (𝜑𝐴 ≠ ∅)
43neneqd 2930 . . . 4 (𝜑 → ¬ 𝐴 = ∅)
5 scott0 9839 . . . . 5 (𝐴 = ∅ ↔ {𝑦𝐴 ∣ ∀𝑧𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
6 df-scott 44225 . . . . . 6 Scott 𝐴 = {𝑦𝐴 ∣ ∀𝑧𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)}
76eqeq1i 2734 . . . . 5 (Scott 𝐴 = ∅ ↔ {𝑦𝐴 ∣ ∀𝑧𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
85, 7bitr4i 278 . . . 4 (𝐴 = ∅ ↔ Scott 𝐴 = ∅)
94, 8sylnib 328 . . 3 (𝜑 → ¬ Scott 𝐴 = ∅)
109neqned 2932 . 2 (𝜑 → Scott 𝐴 ≠ ∅)
11 n0 4316 . 2 (Scott 𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ Scott 𝐴)
1210, 11sylib 218 1 (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wex 1779  wcel 2109  wne 2925  wral 3044  {crab 3405  wss 3914  c0 4296  cfv 6511  rankcrnk 9716  Scott cscott 44224
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 2701  ax-sep 5251  ax-nul 5261  ax-pow 5320  ax-pr 5387  ax-un 7711
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 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-reu 3355  df-rab 3406  df-v 3449  df-sbc 3754  df-csb 3863  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-pss 3934  df-nul 4297  df-if 4489  df-pw 4565  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-int 4911  df-iun 4957  df-iin 4958  df-br 5108  df-opab 5170  df-mpt 5189  df-tr 5215  df-id 5533  df-eprel 5538  df-po 5546  df-so 5547  df-fr 5591  df-we 5593  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-rn 5649  df-res 5650  df-ima 5651  df-pred 6274  df-ord 6335  df-on 6336  df-lim 6337  df-suc 6338  df-iota 6464  df-fun 6513  df-fn 6514  df-f 6515  df-f1 6516  df-fo 6517  df-f1o 6518  df-fv 6519  df-ov 7390  df-om 7843  df-2nd 7969  df-frecs 8260  df-wrecs 8291  df-recs 8340  df-rdg 8378  df-r1 9717  df-rank 9718  df-scott 44225
This theorem is referenced by:  cpcolld  44247
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