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Theorem dfdisjs4 39729
Description: Alternate definition of the class of disjoints. (Contributed by Peter Mazsa, 5-Sep-2021.)
Assertion
Ref Expression
dfdisjs4 Disjs = {𝑟 ∈ Rels ∣ ∀𝑥∃*𝑢 𝑢𝑟𝑥}
Distinct variable group:   𝑢,𝑟,𝑥

Proof of Theorem dfdisjs4
StepHypRef Expression
1 dfdisjs2 39727 . 2 Disjs = {𝑟 ∈ Rels ∣ ≀ ◡𝑟 ⊆ I }
2 cosscnvssid4 39500 . 2 ( ≀ ◡𝑟 ⊆ I ↔ ∀𝑥∃*𝑢 𝑢𝑟𝑥)
31, 2rabbieq 3420 1 Disjs = {𝑟 ∈ Rels ∣ ∀𝑥∃*𝑢 𝑢𝑟𝑥}
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ∀wal 1567   = wceq 1569  ∃*wmo 2562  {crab 3412   ⊆ wss 3895   class class class wbr 5102   I cid 5544  ◡ccnv 5649   ≀ ccoss 39116   Rels crels 39118   Disjs cdisjs 39151
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-rels 39373  df-coss 39434  df-ssr 39511  df-cnvrefs 39538  df-cnvrefrels 39539  df-disjss 39721  df-disjs 39722
This theorem is used by: (None)
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