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Theorem wfelirr 9253
Description: A well-founded set is not a member of itself. This proof does not require the axiom of regularity, unlike elirr 9060. (Contributed by Mario Carneiro, 2-Jan-2017.)
Assertion
Ref Expression
wfelirr (𝐴 (𝑅1 “ On) → ¬ 𝐴𝐴)

Proof of Theorem wfelirr
StepHypRef Expression
1 rankon 9223 . . 3 (rank‘𝐴) ∈ On
21onirri 6296 . 2 ¬ (rank‘𝐴) ∈ (rank‘𝐴)
3 rankelb 9252 . 2 (𝐴 (𝑅1 “ On) → (𝐴𝐴 → (rank‘𝐴) ∈ (rank‘𝐴)))
42, 3mtoi 201 1 (𝐴 (𝑅1 “ On) → ¬ 𝐴𝐴)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wcel 2110   cuni 4837  cima 5557  Oncon0 6190  cfv 6354  𝑅1cr1 9190  rankcrnk 9191
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5202  ax-nul 5209  ax-pow 5265  ax-pr 5329  ax-un 7460
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4567  df-pr 4569  df-tp 4571  df-op 4573  df-uni 4838  df-int 4876  df-iun 4920  df-br 5066  df-opab 5128  df-mpt 5146  df-tr 5172  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6147  df-ord 6193  df-on 6194  df-lim 6195  df-suc 6196  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-f1 6359  df-fo 6360  df-f1o 6361  df-fv 6362  df-om 7580  df-wrecs 7946  df-recs 8007  df-rdg 8045  df-r1 9192  df-rank 9193
This theorem is referenced by:  r1wunlim  10158
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