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Theorem efrirr 4275
Description: Irreflexivity of the epsilon relation: a class founded by epsilon is not a member of itself. (Contributed by NM, 18-Apr-1994.) (Revised by Mario Carneiro, 22-Jun-2015.)
Assertion
Ref Expression
efrirr ( E Fr 𝐴 → ¬ 𝐴𝐴)

Proof of Theorem efrirr
StepHypRef Expression
1 frirrg 4272 . . . 4 (( E Fr 𝐴𝐴𝐴𝐴𝐴) → ¬ 𝐴 E 𝐴)
213anidm23 1275 . . 3 (( E Fr 𝐴𝐴𝐴) → ¬ 𝐴 E 𝐴)
3 epelg 4212 . . . 4 (𝐴𝐴 → (𝐴 E 𝐴𝐴𝐴))
43adantl 275 . . 3 (( E Fr 𝐴𝐴𝐴) → (𝐴 E 𝐴𝐴𝐴))
52, 4mtbid 661 . 2 (( E Fr 𝐴𝐴𝐴) → ¬ 𝐴𝐴)
65pm2.01da 625 1 ( E Fr 𝐴 → ¬ 𝐴𝐴)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 103  wb 104  wcel 1480   class class class wbr 3929   E cep 4209   Fr wfr 4250
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-ral 2421  df-v 2688  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-br 3930  df-opab 3990  df-eprel 4211  df-frfor 4253  df-frind 4254
This theorem is referenced by:  tz7.2  4276
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