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Theorem dfeldisj2 39492
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 39474 . 2 ( ElDisj 𝐴 ↔ Disj ( E ↾ 𝐴))
2 relres 6006 . . 3 Rel ( E ↾ 𝐴)
3 dfdisjALTV2 39481 . . 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 3906   I cid 5557   E cep 5562  ccnv 5662  cres 5665  Rel wrel 5668  ccoss 38865   Disj wdisjALTV 38901   ElDisj weldisj 38903
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 2737  ax-sep 5259  ax-pr 5406
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 2744  df-cleq 2757  df-clel 2840  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5112  df-opab 5176  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-coss 39183  df-cnvrefrel 39289  df-disjALTV 39472  df-eldisj 39474
This theorem is used by: (None)
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