Theorem funcnvtp 6600

Description: The converse triple of ordered pairs is a function if the second members are pairwise different. Note that the second members need not be sets. (Contributed by AV, 23-Jan-2021.)

Assertion

Ref	Expression
funcnvtp	⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩})

Proof of Theorem funcnvtp

Step	Hyp	Ref	Expression
1		simp1 1136	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → 𝐴 ∈ 𝑈)
2		simp2 1137	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → 𝐶 ∈ 𝑉)
3		simp1 1136	. . . 4 ⊢ ((𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → 𝐵 ≠ 𝐷)
4		funcnvpr 6599	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩})
5	1, 2, 3, 4	syl2an3an 1422	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩})
6		funcnvsn 6587	. . . 4 ⊢ Fun ◡{⟨𝐸, 𝐹⟩}
7	6	a1i 11	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun ◡{⟨𝐸, 𝐹⟩})
8		df-rn 5680	. . . . . . 7 ⊢ ran {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩}
9		rnpropg 6210	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉) → ran {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
10	8, 9	eqtr3id 2785	. . . . . 6 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉) → dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
11	10	3adant3 1132	. . . . 5 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
12		df-rn 5680	. . . . . . 7 ⊢ ran {⟨𝐸, 𝐹⟩} = dom ◡{⟨𝐸, 𝐹⟩}
13		rnsnopg 6209	. . . . . . 7 ⊢ (𝐸 ∈ 𝑊 → ran {⟨𝐸, 𝐹⟩} = {𝐹})
14	12, 13	eqtr3id 2785	. . . . . 6 ⊢ (𝐸 ∈ 𝑊 → dom ◡{⟨𝐸, 𝐹⟩} = {𝐹})
15	14	3ad2ant3 1135	. . . . 5 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ◡{⟨𝐸, 𝐹⟩} = {𝐹})
16	11, 15	ineq12d 4209	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ({𝐵, 𝐷} ∩ {𝐹}))
17		disjprsn 4711	. . . . 5 ⊢ ((𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → ({𝐵, 𝐷} ∩ {𝐹}) = ∅)
18	17	3adant1 1130	. . . 4 ⊢ ((𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → ({𝐵, 𝐷} ∩ {𝐹}) = ∅)
19	16, 18	sylan9eq 2791	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ∅)
20		funun 6583	. . 3 ⊢ (((Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∧ Fun ◡{⟨𝐸, 𝐹⟩}) ∧ (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ∅) → Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
21	5, 7, 19, 20	syl21anc 836	. 2 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
22		df-tp 4627	. . . . 5 ⊢ {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = ({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩})
23	22	cnveqi 5866	. . . 4 ⊢ ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = ◡({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩})
24		cnvun 6131	. . . 4 ⊢ ◡({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩}) = (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩})
25	23, 24	eqtri 2759	. . 3 ⊢ ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩})
26	25	funeqi 6558	. 2 ⊢ (Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} ↔ Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
27	21, 26	sylibr 233	1 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩})

Syntax hints:   → wi 4   ∧ wa 396   ∧ w3a 1087   = wceq 1541   ∈ wcel 2106   ≠ wne 2939   ∪ cun 3942   ∩ cin 3943  ∅c0 4318  {csn 4622  {cpr 4624  {ctp 4626  ⟨cop 4628  ^◡ccnv 5668  dom cdm 5669  ran crn 5670  Fun wfun 6526

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-12 2171  ax-ext 2702  ax-sep 5292  ax-nul 5299  ax-pr 5420

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2533  df-clab 2709  df-cleq 2723  df-clel 2809  df-ne 2940  df-ral 3061  df-rex 3070  df-rab 3432  df-v 3475  df-dif 3947  df-un 3949  df-in 3951  df-ss 3961  df-nul 4319  df-if 4523  df-sn 4623  df-pr 4625  df-tp 4627  df-op 4629  df-br 5142  df-opab 5204  df-id 5567  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-fun 6534

This theorem is referenced by:  funcnvs3  14847