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Theorem dfeldisj2 39742
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 39724 . 2 ( ElDisj 𝐴 ↔ Disj (◡ E ↾ 𝐴))
2 relres 5996 . . 3 Rel (◡ E ↾ 𝐴)
3 dfdisjALTV2 39731 . . 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 3899   I cid 5545   E cep 5550  ◡ccnv 5650   ↾ cres 5653  Rel wrel 5656   ≀ ccoss 39115   Disj wdisjALTV 39151   ElDisj weldisj 39153
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 2147  ax-9 2155  ax-11 2194  ax-ext 2733  ax-sep 5249  ax-pr 5391
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 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-coss 39433  df-cnvrefrel 39539  df-disjALTV 39722  df-eldisj 39724
This theorem is used by: (None)
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