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Theorem dfeldisj2 39491
Description: Alternate definition of the disjoint elementhood predicate. (Contributed by Peter Mazsa, 19-Sep-2021.)
Assertion
Ref Expression
dfeldisj2 ( ElDisj 𝐴 ↔ ≀ ( E ↾ 𝐴) ⊆ I )

Proof of Theorem dfeldisj2
StepHypRef Expression
1 df-eldisj 39473 . 2 ( ElDisj 𝐴 ↔ Disj ( E ↾ 𝐴))
2 relres 6007 . . 3 Rel ( E ↾ 𝐴)
3 dfdisjALTV2 39480 . . 3 ( Disj ( E ↾ 𝐴) ↔ ( ≀ ( E ↾ 𝐴) ⊆ I ∧ Rel ( E ↾ 𝐴)))
42, 3mpbiran2 723 . 2 ( Disj ( E ↾ 𝐴) ↔ ≀ ( E ↾ 𝐴) ⊆ I )
51, 4bitri 278 1 ( ElDisj 𝐴 ↔ ≀ ( E ↾ 𝐴) ⊆ I )
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209  wss 3908   I cid 5558   E cep 5563  ccnv 5663  cres 5666  Rel wrel 5669  ccoss 38864   Disj wdisjALTV 38900   ElDisj weldisj 38902
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-11 2195  ax-ext 2738  ax-sep 5260  ax-pr 5407
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2745  df-cleq 2758  df-clel 2841  df-ral 3083  df-rex 3093  df-rab 3420  df-v 3460  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4491  df-sn 4593  df-pr 4595  df-op 4599  df-br 5113  df-opab 5177  df-id 5559  df-xp 5670  df-rel 5671  df-cnv 5672  df-co 5673  df-dm 5674  df-rn 5675  df-res 5676  df-coss 39182  df-cnvrefrel 39288  df-disjALTV 39471  df-eldisj 39473
This theorem is used by: (None)
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