Theorem fiprc 6989

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 4545	. 2 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∉ V
2		vex 2805	. . . . . . . . 9 ⊢ 𝑦 ∈ V
3		snfig 6988	. . . . . . . . 9 ⊢ (𝑦 ∈ V → {𝑦} ∈ Fin)
4	2, 3	ax-mp 5	. . . . . . . 8 ⊢ {𝑦} ∈ Fin
5		eleq1 2294	. . . . . . . 8 ⊢ (𝑥 = {𝑦} → (𝑥 ∈ Fin ↔ {𝑦} ∈ Fin))
6	4, 5	mpbiri 168	. . . . . . 7 ⊢ (𝑥 = {𝑦} → 𝑥 ∈ Fin)
7	6	exlimiv 1646	. . . . . 6 ⊢ (∃𝑦 𝑥 = {𝑦} → 𝑥 ∈ Fin)
8	7	abssi 3302	. . . . 5 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ⊆ Fin
9		ssexg 4228	. . . . 5 ⊢ (({𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ⊆ Fin ∧ Fin ∈ V) → {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V)
10	8, 9	mpan 424	. . . 4 ⊢ (Fin ∈ V → {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V)
11	10	con3i 637	. . 3 ⊢ (¬ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V → ¬ Fin ∈ V)
12		df-nel 2498	. . 3 ⊢ ({𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∉ V ↔ ¬ {𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∈ V)
13		df-nel 2498	. . 3 ⊢ (Fin ∉ V ↔ ¬ Fin ∈ V)
14	11, 12, 13	3imtr4i 201	. 2 ⊢ ({𝑥 ∣ ∃𝑦 𝑥 = {𝑦}} ∉ V → Fin ∉ V)
15	1, 14	ax-mp 5	1 ⊢ Fin ∉ V

Syntax hints:  ¬ wn 3   = wceq 1397  ∃wex 1540   ∈ wcel 2202  {cab 2217   ∉ wnel 2497  Vcvv 2802   ⊆ wss 3200  {csn 3669  Fincfn 6908

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-nel 2498  df-ral 2515  df-rex 2516  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-id 4390  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-1o 6581  df-en 6909  df-fin 6911

This theorem is referenced by: (None)