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Theorem rankval2 3514
Description: Value of an alternate definition of the rank function. Definition of [BellMachover] p. 478.
Assertion
Ref Expression
rankval2 (AB → (rank ‘A) = {x ∈ On∣A ⊆ (R1x)})
Distinct variable group(s):   x,A

Proof of Theorem rankval2
StepHypRef Expression
1 rankvalg 3513 . 2 (AB → (rank ‘A) = {x ∈ On∣A ∈ (R1 ‘suc x)})
2 r1suc 3496 . . . . . 6 (x ∈ On → (R1 ‘suc x) = ℘(R1x))
32eleq2d 1156 . . . . 5 (x ∈ On → (A ∈ (R1 ‘suc x) ↔ A ∈ ℘(R1x)))
4 fvex 2838 . . . . . 6 (R1x) ∈ V
5 elpw2g 1803 . . . . . 6 ((R1x) ∈ V → (A ∈ ℘(R1x) ↔ A ⊆ (R1x)))
64, 5ax-mp 6 . . . . 5 (A ∈ ℘(R1x) ↔ A ⊆ (R1x))
73, 6syl6bb 414 . . . 4 (x ∈ On → (A ∈ (R1 ‘suc x) ↔ A ⊆ (R1x)))
87birabi 1342 . . 3 {x ∈ On∣A ∈ (R1 ‘suc x)} = {x ∈ On∣A ⊆ (R1x)}
98inteqi 1969 . 2 {x ∈ On∣A ∈ (R1 ‘suc x)} = {x ∈ On∣A ⊆ (R1x)}
101, 9syl6eq 1140 1 (AB → (rank ‘A) = {x ∈ On∣A ⊆ (R1x)})
Colors of variables: wff set class
Syntax hints:   → wi 2   ↔ wb 127   = wceq 1091   ∈ wcel 1092  {crab 1204  Vcvv 1348   ⊆ wss 1487  ℘cpw 1798  cint 1965  Oncon0 2199  suc csuc 2201   ‘cfv 2422  R1cr1 3485  rankcrnk 3486
This theorem is referenced by:  rankr1id 3539  ranklon 3540
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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