Theorem fiprc 8977

Description: The class of finite sets is a proper class. (Contributed by Jeff Hankins, 3-Oct-2008.)

Assertion

Ref	Expression
fiprc	⊢ Fin ∉ V

Proof of Theorem fiprc

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		snnex 7698	. 2 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∉ V
2		snfi 8975	. . . . . . . 8 ⊢ {𝑦} ∈ Fin
3		eleq1 2816	. . . . . . . 8 ⊢ (𝑥 = {𝑦} → (𝑥 ∈ Fin ↔ {𝑦} ∈ Fin))
4	2, 3	mpbiri 258	. . . . . . 7 ⊢ (𝑥 = {𝑦} → 𝑥 ∈ Fin)
5	4	exlimiv 1930	. . . . . 6 ⊢ (∃𝑦 𝑥 = {𝑦} → 𝑥 ∈ Fin)
6	5	abssi 4023	. . . . 5 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ⊆ Fin
7		ssexg 5265	. . . . 5 ⊢ (({𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ⊆ Fin ∧ Fin ∈ V) → {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V)
8	6, 7	mpan 690	. . . 4 ⊢ (Fin ∈ V → {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V)
9	8	con3i 154	. . 3 ⊢ (¬ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V → ¬ Fin ∈ V)
10		df-nel 3030	. . 3 ⊢ ({𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∉ V ↔ ¬ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V)
11		df-nel 3030	. . 3 ⊢ (Fin ∉ V ↔ ¬ Fin ∈ V)
12	9, 10, 11	3imtr4i 292	. 2 ⊢ ({𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∉ V → Fin ∉ V)
13	1, 12	ax-mp 5	1 ⊢ Fin ∉ V

Syntax hints:  ¬ wn 3   = wceq 1540  ∃wex 1779   ∈ wcel 2109  {cab 2707   ∉ wnel 3029  Vcvv 3438   ⊆ wss 3905  {csn 4579  Fincfn 8879

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-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5238  ax-nul 5248  ax-pr 5374  ax-un 7675

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-sb 2066  df-mo 2533  df-clab 2708  df-cleq 2721  df-clel 2803  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rab 3397  df-v 3440  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4479  df-pw 4555  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4862  df-iun 4946  df-br 5096  df-opab 5158  df-tr 5203  df-id 5518  df-eprel 5523  df-po 5531  df-so 5532  df-fr 5576  df-we 5578  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-ord 6314  df-on 6315  df-lim 6316  df-suc 6317  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-om 7807  df-1o 8395  df-en 8880  df-fin 8883

This theorem is referenced by: (None)