Theorem unbndrank 9766

Description: The elements of a proper class have unbounded rank. Exercise 2 of [TakeutiZaring] p. 80. (Contributed by NM, 13-Oct-2003.)

Assertion

Ref	Expression
unbndrank	⊢ (¬ 𝐴 ∈ V → ∀𝑥 ∈ On ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦))

Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem unbndrank

Step	Hyp	Ref	Expression
1		rankon 9719	. . . . . . . 8 ⊢ (rank‘𝑦) ∈ On
2		ontri1 6357	. . . . . . . 8 ⊢ (((rank‘𝑦) ∈ On ∧ 𝑥 ∈ On) → ((rank‘𝑦) ⊆ 𝑥 ↔ ¬ 𝑥 ∈ (rank‘𝑦)))
3	1, 2	mpan 691	. . . . . . 7 ⊢ (𝑥 ∈ On → ((rank‘𝑦) ⊆ 𝑥 ↔ ¬ 𝑥 ∈ (rank‘𝑦)))
4	3	ralbidv 3160	. . . . . 6 ⊢ (𝑥 ∈ On → (∀𝑦 ∈ 𝐴 (rank‘𝑦) ⊆ 𝑥 ↔ ∀𝑦 ∈ 𝐴 ¬ 𝑥 ∈ (rank‘𝑦)))
5		ralnex 3063	. . . . . 6 ⊢ (∀𝑦 ∈ 𝐴 ¬ 𝑥 ∈ (rank‘𝑦) ↔ ¬ ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦))
6	4, 5	bitrdi 287	. . . . 5 ⊢ (𝑥 ∈ On → (∀𝑦 ∈ 𝐴 (rank‘𝑦) ⊆ 𝑥 ↔ ¬ ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦)))
7	6	rexbiia 3082	. . . 4 ⊢ (∃𝑥 ∈ On ∀𝑦 ∈ 𝐴 (rank‘𝑦) ⊆ 𝑥 ↔ ∃𝑥 ∈ On ¬ ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦))
8		rexnal 3089	. . . 4 ⊢ (∃𝑥 ∈ On ¬ ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦) ↔ ¬ ∀𝑥 ∈ On ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦))
9	7, 8	bitri 275	. . 3 ⊢ (∃𝑥 ∈ On ∀𝑦 ∈ 𝐴 (rank‘𝑦) ⊆ 𝑥 ↔ ¬ ∀𝑥 ∈ On ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦))
10		bndrank 9765	. . 3 ⊢ (∃𝑥 ∈ On ∀𝑦 ∈ 𝐴 (rank‘𝑦) ⊆ 𝑥 → 𝐴 ∈ V)
11	9, 10	sylbir 235	. 2 ⊢ (¬ ∀𝑥 ∈ On ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦) → 𝐴 ∈ V)
12	11	con1i 147	1 ⊢ (¬ 𝐴 ∈ V → ∀𝑥 ∈ On ∃𝑦 ∈ 𝐴 𝑥 ∈ (rank‘𝑦))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∈ wcel 2114  ∀wral 3051  ∃wrex 3061  Vcvv 3429   ⊆ wss 3889  Oncon0 6323  ‘cfv 6498  rankcrnk 9687

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689  ax-reg 9507  ax-inf2 9562

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-reu 3343  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-pss 3909  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-int 4890  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-tr 5193  df-id 5526  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-pred 6265  df-ord 6326  df-on 6327  df-lim 6328  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506  df-ov 7370  df-om 7818  df-2nd 7943  df-frecs 8231  df-wrecs 8262  df-recs 8311  df-rdg 8349  df-r1 9688  df-rank 9689

This theorem is referenced by: (None)