Theorem funcnvtp 6555

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 1142	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → 𝐴 ∈ 𝑈)
2		simp2 1143	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → 𝐶 ∈ 𝑉)
3		simp1 1142	. . . 4 ⊢ ((𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → 𝐵 ≠ 𝐷)
4		funcnvpr 6554	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩})
5	1, 2, 3, 4	syl2an3an 1430	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩})
6		funcnvsn 6542	. . . 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 5636	. . . . . . 7 ⊢ ran {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩}
9		rnpropg 6180	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉) → ran {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
10	8, 9	eqtr3id 2789	. . . . . 6 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉) → dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
11	10	3adant3 1138	. . . . 5 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = {𝐵, 𝐷})
12		df-rn 5636	. . . . . . 7 ⊢ ran {⟨𝐸, 𝐹⟩} = dom ◡{⟨𝐸, 𝐹⟩}
13		rnsnopg 6179	. . . . . . 7 ⊢ (𝐸 ∈ 𝑊 → ran {⟨𝐸, 𝐹⟩} = {𝐹})
14	12, 13	eqtr3id 2789	. . . . . 6 ⊢ (𝐸 ∈ 𝑊 → dom ◡{⟨𝐸, 𝐹⟩} = {𝐹})
15	14	3ad2ant3 1141	. . . . 5 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → dom ◡{⟨𝐸, 𝐹⟩} = {𝐹})
16	11, 15	ineq12d 4157	. . . 4 ⊢ ((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) → (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ({𝐵, 𝐷} ∩ {𝐹}))
17		disjprsn 4653	. . . . 5 ⊢ ((𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → ({𝐵, 𝐷} ∩ {𝐹}) = ∅)
18	17	3adant1 1136	. . . 4 ⊢ ((𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹) → ({𝐵, 𝐷} ∩ {𝐹}) = ∅)
19	16, 18	sylan9eq 2795	. . 3 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → (dom ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∩ dom ◡{⟨𝐸, 𝐹⟩}) = ∅)
20		funun 6538	. . 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 843	. 2 ⊢ (((𝐴 ∈ 𝑈 ∧ 𝐶 ∈ 𝑉 ∧ 𝐸 ∈ 𝑊) ∧ (𝐵 ≠ 𝐷 ∧ 𝐵 ≠ 𝐹 ∧ 𝐷 ≠ 𝐹)) → Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
22		df-tp 4567	. . . . 5 ⊢ {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = ({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩})
23	22	cnveqi 5823	. . . 4 ⊢ ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = ◡({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩})
24		cnvun 6100	. . . 4 ⊢ ◡({⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ {⟨𝐸, 𝐹⟩}) = (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩})
25	23, 24	eqtri 2763	. . 3 ⊢ ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} = (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩})
26	25	funeqi 6513	. 2 ⊢ (Fun ◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩, ⟨𝐸, 𝐹⟩} ↔ Fun (◡{⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} ∪ ◡{⟨𝐸, 𝐹⟩}))
27	21, 26	sylibr 235	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 1092   = wceq 1547   ∈ wcel 2119   ≠ wne 2935   ∪ cun 3888   ∩ cin 3889  ∅c0 4268  {csn 4562  {cpr 4564  {ctp 4566  ⟨cop 4568  ^◡ccnv 5624  dom cdm 5625  ran crn 5626  Fun wfun 6486

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-12 2189  ax-ext 2712  ax-sep 5225  ax-pr 5369

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-mo 2543  df-clab 2719  df-cleq 2732  df-clel 2815  df-ne 2936  df-ral 3055  df-rex 3065  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4269  df-if 4462  df-sn 4563  df-pr 4565  df-tp 4567  df-op 4569  df-br 5080  df-opab 5142  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-fun 6494

This theorem is referenced by:  funcnvs3  14874