Theorem funcnvtp 6563

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 1137	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → 𝐴 ∈ 𝑈)
2		simp2 1138	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → 𝐶 ∈ 𝑉)
3		simp1 1137	. . . 4 ⊢ ((𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → 𝐵 ≠ 𝐷)
4		funcnvpr 6562	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩})
5	1, 2, 3, 4	syl2an3an 1425	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩})
6		funcnvsn 6550	. . . 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 5643	. . . . . . 7 ⊢ ran {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩}
9		rnpropg 6188	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉) → ran {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
10	8, 9	eqtr3id 2786	. . . . . 6 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉) → dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
11	10	3adant3 1133	. . . . 5 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
12		df-rn 5643	. . . . . . 7 ⊢ ran {⟨𝐸, 𝐹⟩} = dom ◡{⟨𝐸, 𝐹⟩}
13		rnsnopg 6187	. . . . . . 7 ⊢ (𝐸 ∈ 𝑊 → ran {⟨𝐸, 𝐹⟩} = {𝐹})
14	12, 13	eqtr3id 2786	. . . . . 6 ⊢ (𝐸 ∈ 𝑊 → dom ◡{⟨𝐸, 𝐹⟩} = {𝐹})
15	14	3ad2ant3 1136	. . . . 5 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ◡{⟨𝐸, 𝐹⟩} = {𝐹})
16	11, 15	ineq12d 4175	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ({𝐵, 𝐷} ∩ {𝐹}))
17		disjprsn 4673	. . . . 5 ⊢ ((𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → ({𝐵, 𝐷} ∩ {𝐹}) = ∅)
18	17	3adant1 1131	. . . 4 ⊢ ((𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → ({𝐵, 𝐷} ∩ {𝐹}) = ∅)
19	16, 18	sylan9eq 2792	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ∅)
20		funun 6546	. . 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 838	. 2 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
22		df-tp 4587	. . . . 5 ⊢ {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = ({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩})
23	22	cnveqi 5831	. . . 4 ⊢ ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = ◡({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩})
24		cnvun 6108	. . . 4 ⊢ ◡({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩}) = (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩})
25	23, 24	eqtri 2760	. . 3 ⊢ ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩})
26	25	funeqi 6521	. 2 ⊢ (Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} ↔ Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
27	21, 26	sylibr 234	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 395   ∧ w3a 1087   = wceq 1542   ∈ wcel 2114   ≠ wne 2933   ∪ cun 3901   ∩ cin 3902  ∅c0 4287  {csn 4582  {cpr 4584  {ctp 4586  ⟨cop 4588  ^◡ccnv 5631  dom cdm 5632  ran crn 5633  Fun wfun 6494

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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-12 2185  ax-ext 2709  ax-sep 5243  ax-pr 5379

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-mo 2540  df-clab 2716  df-cleq 2729  df-clel 2812  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-tp 4587  df-op 4589  df-br 5101  df-opab 5163  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-fun 6502

This theorem is referenced by:  funcnvs3  14849