Theorem disjres 38741

Description: Disjoint restriction. (Contributed by Peter Mazsa, 25-Aug-2023.)

Assertion

Ref	Expression
disjres	⊢ (Rel 𝑅 → ( Disj (𝑅 ↾ 𝐴) ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅)))

Distinct variable groups:   𝑢,𝐴,𝑣   𝑢,𝑅,𝑣

Proof of Theorem disjres

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		relres 5960	. . . 4 ⊢ Rel (𝑅 ↾ 𝐴)
2		dfdisjALTV4 38713	. . . 4 ⊢ ( Disj (𝑅 ↾ 𝐴) ↔ (∀𝑥∃*𝑢 𝑢(𝑅 ↾ 𝐴)𝑥 ∧ Rel (𝑅 ↾ 𝐴)))
3	1, 2	mpbiran2 710	. . 3 ⊢ ( Disj (𝑅 ↾ 𝐴) ↔ ∀𝑥∃*𝑢 𝑢(𝑅 ↾ 𝐴)𝑥)
4		brres 5941	. . . . . . 7 ⊢ (𝑥 ∈ V → (𝑢(𝑅 ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥)))
5	4	elv 3443	. . . . . 6 ⊢ (𝑢(𝑅 ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥))
6	5	mobii 2541	. . . . 5 ⊢ (∃*𝑢 𝑢(𝑅 ↾ 𝐴)𝑥 ↔ ∃*𝑢(𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥))
7		df-rmo 3345	. . . . 5 ⊢ (∃*𝑢 ∈ 𝐴 𝑢𝑅𝑥 ↔ ∃*𝑢(𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥))
8	6, 7	bitr4i 278	. . . 4 ⊢ (∃*𝑢 𝑢(𝑅 ↾ 𝐴)𝑥 ↔ ∃*𝑢 ∈ 𝐴 𝑢𝑅𝑥)
9	8	albii 1819	. . 3 ⊢ (∀𝑥∃*𝑢 𝑢(𝑅 ↾ 𝐴)𝑥 ↔ ∀𝑥∃*𝑢 ∈ 𝐴 𝑢𝑅𝑥)
10	3, 9	bitri 275	. 2 ⊢ ( Disj (𝑅 ↾ 𝐴) ↔ ∀𝑥∃*𝑢 ∈ 𝐴 𝑢𝑅𝑥)
11		id 22	. . 3 ⊢ (𝑢 = 𝑣 → 𝑢 = 𝑣)
12	11	inecmo 38342	. 2 ⊢ (Rel 𝑅 → (∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅) ↔ ∀𝑥∃*𝑢 ∈ 𝐴 𝑢𝑅𝑥))
13	10, 12	bitr4id 290	1 ⊢ (Rel 𝑅 → ( Disj (𝑅 ↾ 𝐴) ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (𝑢 = 𝑣 ∨ ([𝑢]𝑅 ∩ [𝑣]𝑅) = ∅)))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∨ wo 847  ∀wal 1538   = wceq 1540   ∈ wcel 2109  ∃*wmo 2531  ∀wral 3044  ∃*wrmo 3344  Vcvv 3438   ∩ cin 3904  ∅c0 4286   class class class wbr 5095   ↾ cres 5625  Rel wrel 5628  [cec 8630   Disj wdisjALTV 38208

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 5238  ax-nul 5248  ax-pr 5374

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-rmo 3345  df-rab 3397  df-v 3440  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4479  df-sn 4580  df-pr 4582  df-op 4586  df-br 5096  df-opab 5158  df-id 5518  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-ec 8634  df-coss 38407  df-cnvrefrel 38523  df-disjALTV 38702

This theorem is referenced by:  disjxrnres5  38744