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Theorem dfdisjALTV3 36753
Description: Alternate definition of the disjoint relation predicate, cf. dffunALTV3 36727. (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 36752 . 2 ( Disj 𝑅 ↔ ( ≀ 𝑅 ⊆ I ∧ Rel 𝑅))
2 cosscnvssid3 36521 . . 3 ( ≀ 𝑅 ⊆ I ↔ ∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣))
32anbi1i 623 . 2 (( ≀ 𝑅 ⊆ I ∧ Rel 𝑅) ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
41, 3bitri 274 1 ( Disj 𝑅 ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wal 1537  wss 3883   class class class wbr 5070   I cid 5479  ccnv 5579  Rel wrel 5585  ccoss 36260   Disj wdisjALTV 36294
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pr 5347
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-br 5071  df-opab 5133  df-id 5480  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-coss 36464  df-cnvrefrel 36570  df-disjALTV 36743
This theorem is referenced by:  dfeldisj3  36757
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