Theorem rankr1g 3519

Description: A relationship between the rank function and the cumulative hierarchy of sets function R₁. Proposition 9.15(2) of [TakeutiZaring] p. 79. This more general variant of rankr1 3518 expresses the class existence requirement as an antecedent.

Assertion

Ref	Expression
rankr1g	⊢ (A ∈ C → (B = (rank ‘A) ↔ (¬ A ∈ (R1 ‘B) ∧ A ∈ (R1 ‘suc B))))

Proof of Theorem rankr1g

Step	Hyp	Ref	Expression
1		fveq2 2832	. . . 4 ⊢ (x = A → (rank ‘x) = (rank ‘A))
2	1	cleq2d 1112	. . 3 ⊢ (x = A → (B = (rank ‘x) ↔ B = (rank ‘A)))
3		eleq1 1149	. . . . 5 ⊢ (x = A → (x ∈ (R1 ‘B) ↔ A ∈ (R1 ‘B)))
4	3	negbid 463	. . . 4 ⊢ (x = A → (¬ x ∈ (R1 ‘B) ↔ ¬ A ∈ (R1 ‘B)))
5		eleq1 1149	. . . 4 ⊢ (x = A → (x ∈ (R1 ‘suc B) ↔ A ∈ (R1 ‘suc B)))
6	4, 5	anbi12d 476	. . 3 ⊢ (x = A → ((¬ x ∈ (R1 ‘B) ∧ x ∈ (R1 ‘suc B)) ↔ (¬ A ∈ (R1 ‘B) ∧ A ∈ (R1 ‘suc B))))
7	2, 6	bibi12d 477	. 2 ⊢ (x = A → ((B = (rank ‘x) ↔ (¬ x ∈ (R1 ‘B) ∧ x ∈ (R1 ‘suc B))) ↔ (B = (rank ‘A) ↔ (¬ A ∈ (R1 ‘B) ∧ A ∈ (R1 ‘suc B)))))
8		visset 1350	. . 3 ⊢ x ∈ V
9	8	rankr1 3518	. 2 ⊢ (B = (rank ‘x) ↔ (¬ x ∈ (R1 ‘B) ∧ x ∈ (R1 ‘suc B)))
10	7, 9	vtoclg 1383	1 ⊢ (A ∈ C → (B = (rank ‘A) ↔ (¬ A ∈ (R1 ‘B) ∧ A ∈ (R1 ‘suc B))))

Syntax hints:  ¬ wn 1   → wi 2   ↔ wb 127   ∧ wa 196   = wceq 1091   ∈ wcel 1092  suc csuc 2201   ‘cfv 2422  R₁cr1 3485  rankcrnk 3486

This theorem is referenced by:  rankel 3524  r1rankid 3537

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-un 1076  ax-pow 1077  ax-reg 1078  ax-inf 1079

This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3or 582  df-3an 583  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-ne 1192  df-ral 1205  df-rex 1206  df-rab 1208  df-v 1349  df-sbc 1441  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-pss 1494  df-nul 1708  df-if 1777  df-pw 1799  df-sn 1811  df-pr 1812  df-tp 1814  df-op 1815  df-uni 1920  df-int 1966  df-iun 1996  df-tr 2042  df-br 2063  df-opab 2098  df-eprel 2122  df-id 2125  df-po 2128  df-so 2138  df-fr 2169  df-we 2186  df-ord 2202  df-on 2203  df-lim 2204  df-suc 2205  df-om 2373  df-xp 2424  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fn 2433  df-f 2434  df-f1 2435  df-fv 2438  df-rdg 2970  df-r1 3487  df-rank 3488

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