Theorem dfeldisj3 39310

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 39291	. . 3 ⊢ ( ElDisj 𝐴 ↔ Disj (◡ E ↾ 𝐴))
2		relres 5991	. . . 4 ⊢ Rel (◡ E ↾ 𝐴)
3		dfdisjALTV3 39299	. . . 4 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ (∀𝑢∀𝑣∀𝑥((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣) ∧ Rel (◡ E ↾ 𝐴)))
4	2, 3	mpbiran2 720	. . 3 ⊢ ( Disj (◡ E ↾ 𝐴) ↔ ∀𝑢∀𝑣∀𝑥((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣))
5		an4 666	. . . . . . 7 ⊢ (((𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢) ∧ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑥 ∈ 𝑢 ∧ 𝑥 ∈ 𝑣)))
6		brcnvepres 38771	. . . . . . . . 9 ⊢ ((𝑢 ∈ V ∧ 𝑥 ∈ V) → (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)))
7	6	el2v 3461	. . . . . . . 8 ⊢ (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢))
8		brcnvepres 38771	. . . . . . . . 9 ⊢ ((𝑣 ∈ V ∧ 𝑥 ∈ V) → (𝑣(◡ E ↾ 𝐴)𝑥 ↔ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)))
9	8	el2v 3461	. . . . . . . 8 ⊢ (𝑣(◡ E ↾ 𝐴)𝑥 ↔ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣))
10	7, 9	anbi12i 637	. . . . . . 7 ⊢ ((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢) ∧ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)))
11		elin 3920	. . . . . . . 8 ⊢ (𝑥 ∈ (𝑢 ∩ 𝑣) ↔ (𝑥 ∈ 𝑢 ∧ 𝑥 ∈ 𝑣))
12	11	anbi2i 632	. . . . . . 7 ⊢ (((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑥 ∈ 𝑢 ∧ 𝑥 ∈ 𝑣)))
13	5, 10, 12	3bitr4i 305	. . . . . 6 ⊢ ((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)))
14		df-3an 1100	. . . . . 6 ⊢ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)))
15	13, 14	bitr4i 280	. . . . 5 ⊢ ((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) ↔ (𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)))
16	15	imbi1i 351	. . . 4 ⊢ (((𝑢(◡ E ↾ 𝐴)𝑥 ∧ 𝑣(◡ E ↾ 𝐴)𝑥) → 𝑢 = 𝑣) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) → 𝑢 = 𝑣))
17	16	3albii 1841	. . 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 299	. 2 ⊢ ( ElDisj 𝐴 ↔ ∀𝑢∀𝑣∀𝑥((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴 ∧ 𝑥 ∈ (𝑢 ∩ 𝑣)) → 𝑢 = 𝑣))
19		r3al 3200	. 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 280	1 ⊢ ( ElDisj 𝐴 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ∀𝑥 ∈ (𝑢 ∩ 𝑣)𝑢 = 𝑣)

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 399   ∧ w3a 1098  ∀wal 1558   ∈ wcel 2142  ∀wral 3076  Vcvv 3454   ∩ cin 3903   class class class wbr 5100   E cep 5546  ^◡ccnv 5646   ↾ cres 5649  Rel wrel 5652   Disj wdisjALTV 38718   ElDisj weldisj 38720

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-sep 5246  ax-pr 5390

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-nf 1804  df-sb 2091  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-ral 3077  df-rex 3087  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-id 5542  df-eprel 5547  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-dm 5657  df-rn 5658  df-res 5659  df-coss 39000  df-cnvrefrel 39106  df-disjALTV 39289  df-eldisj 39291

This theorem is referenced by: (None)