Theorem scotteld 44258

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 4301	. . . . . 6 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴)
3	1, 2	sylibr 234	. . . . 5 ⊢ (𝜑 → 𝐴 ≠ ∅)
4	3	neneqd 2931	. . . 4 ⊢ (𝜑 → ¬ 𝐴 = ∅)
5		scott0 9771	. . . . 5 ⊢ (𝐴 = ∅ ↔ {𝑦 ∈ 𝐴 ∣ ∀𝑧 ∈ 𝐴 (rank‘𝑦) ⊆ (rank‘𝑧)} = ∅)
6		df-scott 44248	. . . . . 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 4301	. 2 ⊢ (Scott 𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ Scott 𝐴)
12	10, 11	sylib 218	1 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ Scott 𝐴)

Syntax hints:   → wi 4   = wceq 1541  ∃wex 1780   ∈ wcel 2110   ≠ wne 2926  ∀wral 3045  {crab 3393   ⊆ wss 3900  ∅c0 4281  ‘cfv 6477  rankcrnk 9648  Scott cscott 44247

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2112  ax-9 2120  ax-10 2143  ax-11 2159  ax-12 2179  ax-ext 2702  ax-sep 5232  ax-nul 5242  ax-pow 5301  ax-pr 5368  ax-un 7663

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2067  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 3345  df-rab 3394  df-v 3436  df-sbc 3740  df-csb 3849  df-dif 3903  df-un 3905  df-in 3907  df-ss 3917  df-pss 3920  df-nul 4282  df-if 4474  df-pw 4550  df-sn 4575  df-pr 4577  df-op 4581  df-uni 4858  df-int 4896  df-iun 4941  df-iin 4942  df-br 5090  df-opab 5152  df-mpt 5171  df-tr 5197  df-id 5509  df-eprel 5514  df-po 5522  df-so 5523  df-fr 5567  df-we 5569  df-xp 5620  df-rel 5621  df-cnv 5622  df-co 5623  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-pred 6244  df-ord 6305  df-on 6306  df-lim 6307  df-suc 6308  df-iota 6433  df-fun 6479  df-fn 6480  df-f 6481  df-f1 6482  df-fo 6483  df-f1o 6484  df-fv 6485  df-ov 7344  df-om 7792  df-2nd 7917  df-frecs 8206  df-wrecs 8237  df-recs 8286  df-rdg 8324  df-r1 9649  df-rank 9650  df-scott 44248

This theorem is referenced by:  cpcolld  44270