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Theorem scotteld 44690
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 4281 . . . . . 6 (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥𝐴)
31, 2sylibr 235 . . . . 5 (𝜑𝐴 ≠ ∅)
43neneqd 2939 . . . 4 (𝜑 → ¬ 𝐴 = ∅)
5 scott0 9801 . . . . 5 (𝐴 = ∅ ↔ {𝑦𝐴 ∣ ∀𝑧𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
6 df-scott 44680 . . . . . 6 Scott 𝐴 = {𝑦𝐴 ∣ ∀𝑧𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)}
76eqeq1i 2744 . . . . 5 (Scott 𝐴 = ∅ ↔ {𝑦𝐴 ∣ ∀𝑧𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
85, 7bitr4i 279 . . . 4 (𝐴 = ∅ ↔ Scott 𝐴 = ∅)
94, 8sylnib 329 . . 3 (𝜑 → ¬ Scott 𝐴 = ∅)
109neqned 2941 . 2 (𝜑 → Scott 𝐴 ≠ ∅)
11 n0 4281 . 2 (Scott 𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ Scott 𝐴)
1210, 11sylib 219 1 (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1547  wex 1786  wcel 2119  wne 2934  wral 3053  {crab 3391  wss 3883  c0 4261  cfv 6485  rankcrnk 9678  Scott cscott 44679
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-sep 5218  ax-nul 5228  ax-pow 5294  ax-pr 5362  ax-un 7678
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3or 1093  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-ne 2935  df-ral 3054  df-rex 3064  df-reu 3345  df-rab 3392  df-v 3433  df-sbc 3724  df-csb 3832  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3903  df-nul 4262  df-if 4455  df-pw 4531  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-int 4878  df-iun 4923  df-iin 4924  df-br 5073  df-opab 5135  df-mpt 5154  df-tr 5180  df-id 5513  df-eprel 5518  df-po 5526  df-so 5527  df-fr 5571  df-we 5573  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-dm 5628  df-rn 5629  df-res 5630  df-ima 5631  df-pred 6252  df-ord 6313  df-on 6314  df-lim 6315  df-suc 6316  df-iota 6441  df-fun 6487  df-fn 6488  df-f 6489  df-f1 6490  df-fo 6491  df-f1o 6492  df-fv 6493  df-ov 7359  df-om 7807  df-2nd 7932  df-frecs 8221  df-wrecs 8252  df-recs 8301  df-rdg 8339  df-r1 9679  df-rank 9680  df-scott 44680
This theorem is referenced by:  cpcolld  44702
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