Theorem dfeldisj3 39350

Description: Alternate definition of the disjoint elementhood predicate. (Contributed by Peter Mazsa, 19-Sep-2021.)

Assertion

Ref	Expression
dfeldisj3	⊢ ( ElDisj 𝐴 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ∀𝑥 ∈ (𝑢 ∩ 𝑣)𝑢 = 𝑣)

Distinct variable group:   𝑢,𝐴,𝑣,𝑥

Proof of Theorem dfeldisj3

Step	Hyp	Ref	Expression
1		df-eldisj 39331	. . 3 ⊢ ( ElDisj 𝐴 ↔ Disj (◡ E ↾ 𝐴))
2		relres 6005	. . . 4 ⊢ Rel (◡ E ↾ 𝐴)
3		dfdisjALTV3 39339	. . . 4 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ (∀𝑢∀𝑣∀𝑥((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣) ∧ Rel (◡ E ↾ 𝐴)))
4	2, 3	mpbiran2 722	. . 3 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ ∀𝑢∀𝑣∀𝑥((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣))
5		an4 668	. . . . . . 7 ⊢ (((𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢) ∧ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑥 ∈ 𝑢 ∧ 𝑥 ∈ 𝑣)))
6		brcnvepres 38811	. . . . . . . . 9 ⊢ ((𝑢 ∈ V ∧ 𝑥 ∈ V) → (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)))
7	6	el2v 3470	. . . . . . . 8 ⊢ (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢))
8		brcnvepres 38811	. . . . . . . . 9 ⊢ ((𝑣 ∈ V ∧ 𝑥 ∈ V) → (𝑣(◡ E ↾ 𝐴)𝑥 ↔ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)))
9	8	el2v 3470	. . . . . . . 8 ⊢ (𝑣(◡ E ↾ 𝐴)𝑥 ↔ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣))
10	7, 9	anbi12i 639	. . . . . . 7 ⊢ ((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢) ∧ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)))
11		elin 3929	. . . . . . . 8 ⊢ (𝑥 ∈ (𝑢 ∩ 𝑣) ↔ (𝑥 ∈ 𝑢 ∧ 𝑥 ∈ 𝑣))
12	11	anbi2i 634	. . . . . . 7 ⊢ (((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑥 ∈ 𝑢 ∧ 𝑥 ∈ 𝑣)))
13	5, 10, 12	3bitr4i 306	. . . . . 6 ⊢ ((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)))
14		df-3an 1103	. . . . . 6 ⊢ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)))
15	13, 14	bitr4i 281	. . . . 5 ⊢ ((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) ↔ (𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)))
16	15	imbi1i 352	. . . 4 ⊢ (((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) → 𝑢 = 𝑣))
17	16	3albii 1848	. . 3 ⊢ (∀𝑢∀𝑣∀𝑥((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣) ↔ ∀𝑢∀𝑣∀𝑥((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) → 𝑢 = 𝑣))
18	1, 4, 17	3bitri 300	. 2 ⊢ ( ElDisj 𝐴 ↔ ∀𝑢∀𝑣∀𝑥((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) → 𝑢 = 𝑣))
19		r3al 3209	. 2 ⊢ (∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ∀𝑥 ∈ (𝑢 ∩ 𝑣)𝑢 = 𝑣 ↔ ∀𝑢∀𝑣∀𝑥((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) → 𝑢 = 𝑣))
20	18, 19	bitr4i 281	1 ⊢ ( ElDisj 𝐴 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ∀𝑥 ∈ (𝑢 ∩ 𝑣)𝑢 = 𝑣)

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 400   ∧ w3a 1101  ∀wal 1565   ∈ wcel 2149  ∀wral 3085  Vcvv 3463   ∩ cin 3912   class class class wbr 5113   E cep 5561  ^◡ccnv 5661   ↾ cres 5664  Rel wrel 5667   Disj wdisjALTV 38758   ElDisj weldisj 38760

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-pr 5405

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-br 5114  df-opab 5178  df-id 5557  df-eprel 5562  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-coss 39040  df-cnvrefrel 39146  df-disjALTV 39329  df-eldisj 39331

This theorem is referenced by: (None)