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Theorem wfelirr 8633
Description: A well-founded set is not a member of itself. This proof does not require the axiom of regularity, unlike elirr 8450. (Contributed by Mario Carneiro, 2-Jan-2017.)
Assertion
Ref Expression
wfelirr (𝐴 (𝑅1 “ On) → ¬ 𝐴𝐴)

Proof of Theorem wfelirr
StepHypRef Expression
1 rankon 8603 . . 3 (rank‘𝐴) ∈ On
21onirri 5796 . 2 ¬ (rank‘𝐴) ∈ (rank‘𝐴)
3 rankelb 8632 . 2 (𝐴 (𝑅1 “ On) → (𝐴𝐴 → (rank‘𝐴) ∈ (rank‘𝐴)))
42, 3mtoi 190 1 (𝐴 (𝑅1 “ On) → ¬ 𝐴𝐴)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wcel 1992   cuni 4407  cima 5082  Oncon0 5685  cfv 5850  𝑅1cr1 8570  rankcrnk 8571
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1841  ax-6 1890  ax-7 1937  ax-8 1994  ax-9 2001  ax-10 2021  ax-11 2036  ax-12 2049  ax-13 2250  ax-ext 2606  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6903
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1883  df-eu 2478  df-mo 2479  df-clab 2613  df-cleq 2619  df-clel 2622  df-nfc 2756  df-ne 2797  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3193  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-pss 3576  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-we 5040  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-pred 5642  df-ord 5688  df-on 5689  df-lim 5690  df-suc 5691  df-iota 5813  df-fun 5852  df-fn 5853  df-f 5854  df-f1 5855  df-fo 5856  df-f1o 5857  df-fv 5858  df-om 7014  df-wrecs 7353  df-recs 7414  df-rdg 7452  df-r1 8572  df-rank 8573
This theorem is referenced by:  r1wunlim  9504
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