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Theorem dfdisjALTV3 39300
Description: Alternate definition of the disjoint relation predicate, cf. dffunALTV3 39274. (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 39299 . 2 ( Disj 𝑅 ↔ ( ≀ 𝑅 ⊆ I ∧ Rel 𝑅))
2 cosscnvssid3 39066 . . 3 ( ≀ 𝑅 ⊆ I ↔ ∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣))
32anbi1i 633 . 2 (( ≀ 𝑅 ⊆ I ∧ Rel 𝑅) ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
41, 3bitri 277 1 ( Disj 𝑅 ↔ (∀𝑢𝑣𝑥((𝑢𝑅𝑥𝑣𝑅𝑥) → 𝑢 = 𝑣) ∧ Rel 𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 399  wal 1559  wss 3905   class class class wbr 5101   I cid 5542  ccnv 5647  Rel wrel 5653  ccoss 38683   Disj wdisjALTV 38719
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1816  ax-4 1830  ax-5 1931  ax-6 1988  ax-7 2029  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5247  ax-pr 5391
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1564  df-fal 1574  df-ex 1801  df-nf 1805  df-sb 2092  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ral 3078  df-rex 3088  df-rab 3416  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-br 5102  df-opab 5164  df-id 5543  df-xp 5654  df-rel 5655  df-cnv 5656  df-co 5657  df-dm 5658  df-rn 5659  df-res 5660  df-coss 39001  df-cnvrefrel 39107  df-disjALTV 39290
This theorem is referenced by:  dfeldisj3  39311
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