Theorem dfeldisj3 39480

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 39461	. . 3 ⊢ ( ElDisj 𝐴 ↔ Disj (◡ E ↾ 𝐴))
2		relres 6004	. . . 4 ⊢ Rel (◡ E ↾ 𝐴)
3		dfdisjALTV3 39469	. . . 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 38941	. . . . . . . . 9 ⊢ ((𝑢 ∈ V ∧ 𝑥 ∈ V) → (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢)))
7	6	el2v 3462	. . . . . . . 8 ⊢ (𝑢(◡ E ↾ 𝐴)𝑥 ↔ (𝑢 ∈ 𝐴 ∧ 𝑥 ∈ 𝑢))
8		brcnvepres 38941	. . . . . . . . 9 ⊢ ((𝑣 ∈ V ∧ 𝑥 ∈ V) → (𝑣(◡ E ↾ 𝐴)𝑥 ↔ (𝑣 ∈ 𝐴 ∧ 𝑥 ∈ 𝑣)))
9	8	el2v 3462	. . . . . . . 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 3921	. . . . . . . 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 1105	. . . . . 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 1851	. . 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 3203	. 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 1103  ∀wal 1568   ∈ wcel 2143  ∀wral 3079  Vcvv 3455   ∩ cin 3904   class class class wbr 5109   E cep 5560  ^◡ccnv 5660   ↾ cres 5663  Rel wrel 5666   Disj wdisjALTV 38888   ElDisj weldisj 38890

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-pr 5404

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-br 5110  df-opab 5174  df-id 5556  df-eprel 5561  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-coss 39170  df-cnvrefrel 39276  df-disjALTV 39459  df-eldisj 39461

This theorem is referenced by: (None)