Theorem scotteld 40656

Description: The Scott operation sends inhabited classes to inhabited sets. (Contributed by Rohan Ridenour, 11-Aug-2023.)

Hypothesis

Ref	Expression
scotteld.1	⊢ (𝜑 → ∃𝑥 𝑥 ∈ 𝐴)

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.

Step	Hyp	Ref	Expression
1		scotteld.1	. . . . . 6 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ 𝐴)
2		n0 4303	. . . . . 6 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴)
3	1, 2	sylibr 236	. . . . 5 ⊢ (𝜑 → 𝐴 ≠ ∅)
4	3	neneqd 3020	. . . 4 ⊢ (𝜑 → ¬ 𝐴 = ∅)
5		scott0 9308	. . . . 5 ⊢ (𝐴 = ∅ ↔ {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
6		df-scott 40646	. . . . . 6 ⊢ Scott 𝐴 = {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)}
7	6	eqeq1i 2825	. . . . 5 ⊢ (Scott 𝐴 = ∅ ↔ {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
8	5, 7	bitr4i 280	. . . 4 ⊢ (𝐴 = ∅ ↔ Scott 𝐴 = ∅)
9	4, 8	sylnib 330	. . 3 ⊢ (𝜑 → ¬ Scott 𝐴 = ∅)
10	9	neqned 3022	. 2 ⊢ (𝜑 → Scott 𝐴 ≠ ∅)
11		n0 4303	. 2 ⊢ (Scott 𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ Scott 𝐴)
12	10, 11	sylib 220	1 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴)

Syntax hints:   → wi 4   = wceq 1536  ∃wex 1779   ∈ wcel 2113   ≠ wne 3015  ∀wral 3137  {crab 3141   ⊆ wss 3929  ∅c0 4284  ‘cfv 6348  rankcrnk 9185  Scott cscott 40645

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 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1083  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-ral 3142  df-rex 3143  df-reu 3144  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-pss 3947  df-nul 4285  df-if 4461  df-pw 4534  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-int 4870  df-iun 4914  df-iin 4915  df-br 5060  df-opab 5122  df-mpt 5140  df-tr 5166  df-id 5453  df-eprel 5458  df-po 5467  df-so 5468  df-fr 5507  df-we 5509  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-pred 6141  df-ord 6187  df-on 6188  df-lim 6189  df-suc 6190  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-om 7574  df-wrecs 7940  df-recs 8001  df-rdg 8039  df-r1 9186  df-rank 9187  df-scott 40646

This theorem is referenced by:  cpcolld  40668