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Theorem efrunt 30340
Description: If  A is well-founded by  _E, then it is untangled. (Contributed by Scott Fenton, 1-Mar-2011.)
Assertion
Ref Expression
efrunt  |-  (  _E  Fr  A  ->  A. x  e.  A  -.  x  e.  x )
Distinct variable group:    x, A

Proof of Theorem efrunt
StepHypRef Expression
1 frirr 4811 . . 3  |-  ( (  _E  Fr  A  /\  x  e.  A )  ->  -.  x  _E  x
)
2 epel 4748 . . 3  |-  ( x  _E  x  <->  x  e.  x )
31, 2sylnib 306 . 2  |-  ( (  _E  Fr  A  /\  x  e.  A )  ->  -.  x  e.  x
)
43ralrimiva 2802 1  |-  (  _E  Fr  A  ->  A. x  e.  A  -.  x  e.  x )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 371    e. wcel 1887   A.wral 2737   class class class wbr 4402    _E cep 4743    Fr wfr 4790
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1669  ax-4 1682  ax-5 1758  ax-6 1805  ax-7 1851  ax-9 1896  ax-10 1915  ax-11 1920  ax-12 1933  ax-13 2091  ax-ext 2431  ax-sep 4525  ax-nul 4534  ax-pr 4639
This theorem depends on definitions:  df-bi 189  df-or 372  df-an 373  df-3an 987  df-tru 1447  df-ex 1664  df-nf 1668  df-sb 1798  df-eu 2303  df-mo 2304  df-clab 2438  df-cleq 2444  df-clel 2447  df-nfc 2581  df-ne 2624  df-ral 2742  df-rex 2743  df-rab 2746  df-v 3047  df-sbc 3268  df-dif 3407  df-un 3409  df-in 3411  df-ss 3418  df-nul 3732  df-if 3882  df-sn 3969  df-pr 3971  df-op 3975  df-br 4403  df-opab 4462  df-eprel 4745  df-fr 4793
This theorem is referenced by: (None)
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