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Theorem eldisjn0el 38791
Description: Special case of disjdmqseq 38790 (perhaps this is the closest theorem to the former prter2 38867). (Contributed by Peter Mazsa, 26-Sep-2021.)
Assertion
Ref Expression
eldisjn0el ( ElDisj 𝐴 → (¬ ∅ ∈ 𝐴 ↔ ( 𝐴 /𝐴) = 𝐴))

Proof of Theorem eldisjn0el
StepHypRef Expression
1 disjdmqseq 38790 . 2 ( Disj ( E ↾ 𝐴) → ((dom ( E ↾ 𝐴) / ( E ↾ 𝐴)) = 𝐴 ↔ (dom ≀ ( E ↾ 𝐴) / ≀ ( E ↾ 𝐴)) = 𝐴))
2 df-eldisj 38692 . 2 ( ElDisj 𝐴 ↔ Disj ( E ↾ 𝐴))
3 n0el3 38636 . . 3 (¬ ∅ ∈ 𝐴 ↔ (dom ( E ↾ 𝐴) / ( E ↾ 𝐴)) = 𝐴)
4 dmqs1cosscnvepreseq 38647 . . . 4 ((dom ≀ ( E ↾ 𝐴) / ≀ ( E ↾ 𝐴)) = 𝐴 ↔ ( 𝐴 /𝐴) = 𝐴)
54bicomi 224 . . 3 (( 𝐴 /𝐴) = 𝐴 ↔ (dom ≀ ( E ↾ 𝐴) / ≀ ( E ↾ 𝐴)) = 𝐴)
63, 5bibi12i 339 . 2 ((¬ ∅ ∈ 𝐴 ↔ ( 𝐴 /𝐴) = 𝐴) ↔ ((dom ( E ↾ 𝐴) / ( E ↾ 𝐴)) = 𝐴 ↔ (dom ≀ ( E ↾ 𝐴) / ≀ ( E ↾ 𝐴)) = 𝐴))
71, 2, 63imtr4i 292 1 ( ElDisj 𝐴 → (¬ ∅ ∈ 𝐴 ↔ ( 𝐴 /𝐴) = 𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 206   = wceq 1540  wcel 2109  c0 4292   cuni 4867   E cep 5530  ccnv 5630  dom cdm 5631  cres 5633   / cqs 8647  ccoss 38162  ccoels 38163   Disj wdisjALTV 38196   ElDisj weldisj 38198
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5246  ax-nul 5256  ax-pr 5382
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rmo 3351  df-rab 3403  df-v 3446  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4293  df-if 4485  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-br 5103  df-opab 5165  df-id 5526  df-eprel 5531  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-ec 8650  df-qs 8654  df-coss 38395  df-coels 38396  df-cnvrefrel 38511  df-disjALTV 38690  df-eldisj 38692
This theorem is referenced by:  mainer  38819
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