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Theorem eldisjs5 36833
Description: Elementhood in the class of disjoints. (Contributed by Peter Mazsa, 5-Sep-2021.)
Assertion
Ref Expression
eldisjs5 (𝑅𝑉 → (𝑅 ∈ Disjs ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ 𝑅 ∈ Rels )))
Distinct variable group:   𝑢,𝑅,𝑣
Allowed substitution hints:   𝑉(𝑣,𝑢)

Proof of Theorem eldisjs5
StepHypRef Expression
1 eldisjs2 36830 . 2 (𝑅 ∈ Disjs ↔ ( ≀ 𝑅 ⊆ I ∧ 𝑅 ∈ Rels ))
2 cosscnvssid5 36592 . . 3 (( ≀ 𝑅 ⊆ I ∧ Rel 𝑅) ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ Rel 𝑅))
3 elrelsrel 36601 . . . . 5 (𝑅𝑉 → (𝑅 ∈ Rels ↔ Rel 𝑅))
43anbi2d 629 . . . 4 (𝑅𝑉 → (( ≀ 𝑅 ⊆ I ∧ 𝑅 ∈ Rels ) ↔ ( ≀ 𝑅 ⊆ I ∧ Rel 𝑅)))
53anbi2d 629 . . . 4 (𝑅𝑉 → ((∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ 𝑅 ∈ Rels ) ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ Rel 𝑅)))
64, 5bibi12d 346 . . 3 (𝑅𝑉 → ((( ≀ 𝑅 ⊆ I ∧ 𝑅 ∈ Rels ) ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ 𝑅 ∈ Rels )) ↔ (( ≀ 𝑅 ⊆ I ∧ Rel 𝑅) ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ Rel 𝑅))))
72, 6mpbiri 257 . 2 (𝑅𝑉 → (( ≀ 𝑅 ⊆ I ∧ 𝑅 ∈ Rels ) ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ 𝑅 ∈ Rels )))
81, 7syl5bb 283 1 (𝑅𝑉 → (𝑅 ∈ Disjs ↔ (∀𝑢 ∈ dom 𝑅𝑣 ∈ dom 𝑅(𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ∧ 𝑅 ∈ Rels )))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396  wo 844   = wceq 1542  wcel 2110  wral 3066  cin 3891  wss 3892  c0 4262   I cid 5489  ccnv 5589  dom cdm 5590  Rel wrel 5595  [cec 8479  ccoss 36329   Rels crels 36331   Disjs cdisjs 36362
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2711  ax-sep 5227  ax-nul 5234  ax-pow 5292  ax-pr 5356  ax-un 7582
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2072  df-mo 2542  df-eu 2571  df-clab 2718  df-cleq 2732  df-clel 2818  df-nfc 2891  df-ral 3071  df-rex 3072  df-rmo 3074  df-rab 3075  df-v 3433  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-nul 4263  df-if 4466  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4846  df-br 5080  df-opab 5142  df-id 5490  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-ec 8483  df-coss 36533  df-rels 36599  df-ssr 36612  df-cnvrefs 36637  df-cnvrefrels 36638  df-disjss 36810  df-disjs 36811
This theorem is referenced by: (None)
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