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Theorem rankvaln 9212
Description: Value of the rank function at a non-well-founded set. (The antecedent is always false under Foundation, by unir1 9226, unless 𝐴 is a proper class.) (Contributed by Mario Carneiro, 22-Mar-2013.) (Revised by Mario Carneiro, 10-Sep-2013.)
Assertion
Ref Expression
rankvaln 𝐴 (𝑅1 “ On) → (rank‘𝐴) = ∅)

Proof of Theorem rankvaln
StepHypRef Expression
1 rankf 9207 . . . 4 rank: (𝑅1 “ On)⟶On
21fdmi 6505 . . 3 dom rank = (𝑅1 “ On)
32eleq2i 2907 . 2 (𝐴 ∈ dom rank ↔ 𝐴 (𝑅1 “ On))
4 ndmfv 6681 . 2 𝐴 ∈ dom rank → (rank‘𝐴) = ∅)
53, 4sylnbir 334 1 𝐴 (𝑅1 “ On) → (rank‘𝐴) = ∅)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1538  wcel 2115  c0 4274   cuni 4819  dom cdm 5536  cima 5539  Oncon0 6172  cfv 6336  𝑅1cr1 9175  rankcrnk 9176
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 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-sep 5184  ax-nul 5191  ax-pow 5247  ax-pr 5311  ax-un 7444
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3014  df-ral 3137  df-rex 3138  df-reu 3139  df-rab 3141  df-v 3481  df-sbc 3758  df-csb 3866  df-dif 3921  df-un 3923  df-in 3925  df-ss 3935  df-pss 3937  df-nul 4275  df-if 4449  df-pw 4522  df-sn 4549  df-pr 4551  df-tp 4553  df-op 4555  df-uni 4820  df-int 4858  df-iun 4902  df-br 5048  df-opab 5110  df-mpt 5128  df-tr 5154  df-id 5441  df-eprel 5446  df-po 5455  df-so 5456  df-fr 5495  df-we 5497  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 6129  df-ord 6175  df-on 6176  df-lim 6177  df-suc 6178  df-iota 6295  df-fun 6338  df-fn 6339  df-f 6340  df-f1 6341  df-fo 6342  df-f1o 6343  df-fv 6344  df-om 7564  df-wrecs 7930  df-recs 7991  df-rdg 8029  df-r1 9177  df-rank 9178
This theorem is referenced by:  rankdmr1  9214  rankcf  10184
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