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Theorem rankpwg 34157
Description: The rank of a power set. Closed form of rankpw 9424. (Contributed by Scott Fenton, 16-Jul-2015.)
Assertion
Ref Expression
rankpwg (𝐴𝑉 → (rank‘𝒫 𝐴) = suc (rank‘𝐴))

Proof of Theorem rankpwg
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 pweq 4515 . . . 4 (𝑥 = 𝐴 → 𝒫 𝑥 = 𝒫 𝐴)
21fveq2d 6699 . . 3 (𝑥 = 𝐴 → (rank‘𝒫 𝑥) = (rank‘𝒫 𝐴))
3 fveq2 6695 . . . 4 (𝑥 = 𝐴 → (rank‘𝑥) = (rank‘𝐴))
4 suceq 6256 . . . 4 ((rank‘𝑥) = (rank‘𝐴) → suc (rank‘𝑥) = suc (rank‘𝐴))
53, 4syl 17 . . 3 (𝑥 = 𝐴 → suc (rank‘𝑥) = suc (rank‘𝐴))
62, 5eqeq12d 2752 . 2 (𝑥 = 𝐴 → ((rank‘𝒫 𝑥) = suc (rank‘𝑥) ↔ (rank‘𝒫 𝐴) = suc (rank‘𝐴)))
7 vex 3402 . . 3 𝑥 ∈ V
87rankpw 9424 . 2 (rank‘𝒫 𝑥) = suc (rank‘𝑥)
96, 8vtoclg 3471 1 (𝐴𝑉 → (rank‘𝒫 𝐴) = suc (rank‘𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1543  wcel 2112  𝒫 cpw 4499  suc csuc 6193  cfv 6358  rankcrnk 9344
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2018  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2160  ax-12 2177  ax-ext 2708  ax-rep 5164  ax-sep 5177  ax-nul 5184  ax-pow 5243  ax-pr 5307  ax-un 7501  ax-reg 9186  ax-inf2 9234
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3or 1090  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2073  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2728  df-clel 2809  df-nfc 2879  df-ne 2933  df-ral 3056  df-rex 3057  df-reu 3058  df-rab 3060  df-v 3400  df-sbc 3684  df-csb 3799  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-pss 3872  df-nul 4224  df-if 4426  df-pw 4501  df-sn 4528  df-pr 4530  df-tp 4532  df-op 4534  df-uni 4806  df-int 4846  df-iun 4892  df-br 5040  df-opab 5102  df-mpt 5121  df-tr 5147  df-id 5440  df-eprel 5445  df-po 5453  df-so 5454  df-fr 5494  df-we 5496  df-xp 5542  df-rel 5543  df-cnv 5544  df-co 5545  df-dm 5546  df-rn 5547  df-res 5548  df-ima 5549  df-pred 6140  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6316  df-fun 6360  df-fn 6361  df-f 6362  df-f1 6363  df-fo 6364  df-f1o 6365  df-fv 6366  df-om 7623  df-wrecs 8025  df-recs 8086  df-rdg 8124  df-r1 9345  df-rank 9346
This theorem is referenced by:  hfpw  34173
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