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Theorem dfdisjALTV3 38700
Description: Alternate definition of the disjoint relation predicate, cf. dffunALTV3 38674. (Contributed by Peter Mazsa, 28-Jul-2021.)
Assertion
Ref Expression
dfdisjALTV3 ( Disj 𝑅 ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
Distinct variable group:   𝑢,𝑅,𝑣,𝑥

Proof of Theorem dfdisjALTV3
StepHypRef Expression
1 dfdisjALTV2 38699 . 2 ( Disj 𝑅 ↔ ( ≀ 𝑅 ⊆ I ∧ Rel 𝑅))
2 cosscnvssid3 38460 . . 3 ( ≀ 𝑅 ⊆ I ↔ ∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣))
32anbi1i 624 . 2 (( ≀ 𝑅 ⊆ I ∧ Rel 𝑅) ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
41, 3bitri 275 1 ( Disj 𝑅 ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wal 1538  wss 3911   class class class wbr 5102   I cid 5525  ccnv 5630  Rel wrel 5636  ccoss 38162   Disj wdisjALTV 38196
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-ral 3045  df-rex 3054  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-br 5103  df-opab 5165  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-coss 38395  df-cnvrefrel 38511  df-disjALTV 38690
This theorem is referenced by:  dfeldisj3  38704
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