Theorem mptprop 32850

Description: Rewrite pairs of ordered pairs as mapping to functions. (Contributed by Thierry Arnoux, 24-Sep-2023.)

Hypotheses

Ref	Expression
brprop.a	⊢ (𝜑 → 𝐴 ∈ 𝑉)
brprop.b	⊢ (𝜑 → 𝐵 ∈ 𝑊)
brprop.c	⊢ (𝜑 → 𝐶 ∈ 𝑉)
brprop.d	⊢ (𝜑 → 𝐷 ∈ 𝑊)
mptprop.1	⊢ (𝜑 → 𝐴 ≠ 𝐶)

Assertion

Ref	Expression
mptprop	⊢ (𝜑 → {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐶   𝑥,𝐷   𝜑,𝑥

Allowed substitution hints:   𝑉(𝑥)   𝑊(𝑥)

Proof of Theorem mptprop

Step	Hyp	Ref	Expression
1		df-pr 4584	. 2 ⊢ {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩})
2		brprop.a	. . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
3		brprop.b	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ 𝑊)
4		fmptsn 7147	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {⟨𝐴, 𝐵⟩} = (𝑥 ∈ {𝐴} ↦ 𝐵))
5	2, 3, 4	syl2anc 593	. . . . . 6 ⊢ (𝜑 → {⟨𝐴, 𝐵⟩} = (𝑥 ∈ {𝐴} ↦ 𝐵))
6		incom 4161	. . . . . . . 8 ⊢ ({𝐴} ∩ {𝐴, 𝐶}) = ({𝐴, 𝐶} ∩ {𝐴})
7		prid1g 4718	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴, 𝐶})
8		snssi 4743	. . . . . . . . . 10 ⊢ (𝐴 ∈ {𝐴, 𝐶} → {𝐴} ⊆ {𝐴, 𝐶})
9	2, 7, 8	3syl 18	. . . . . . . . 9 ⊢ (𝜑 → {𝐴} ⊆ {𝐴, 𝐶})
10		dfss2 3922	. . . . . . . . 9 ⊢ ({𝐴} ⊆ {𝐴, 𝐶} ↔ ({𝐴} ∩ {𝐴, 𝐶}) = {𝐴})
11	9, 10	sylib 220	. . . . . . . 8 ⊢ (𝜑 → ({𝐴} ∩ {𝐴, 𝐶}) = {𝐴})
12	6, 11	eqtr3id 2810	. . . . . . 7 ⊢ (𝜑 → ({𝐴, 𝐶} ∩ {𝐴}) = {𝐴})
13	12	mpteq1d 5189	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵) = (𝑥 ∈ {𝐴} ↦ 𝐵))
14	5, 13	eqtr4d 2799	. . . . 5 ⊢ (𝜑 → {⟨𝐴, 𝐵⟩} = (𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵))
15		brprop.c	. . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ 𝑉)
16		brprop.d	. . . . . . 7 ⊢ (𝜑 → 𝐷 ∈ 𝑊)
17		fmptsn 7147	. . . . . . 7 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑊) → {⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐶} ↦ 𝐷))
18	15, 16, 17	syl2anc 593	. . . . . 6 ⊢ (𝜑 → {⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐶} ↦ 𝐷))
19		mptprop.1	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ≠ 𝐶)
20		difprsn1 4759	. . . . . . . 8 ⊢ (𝐴 ≠ 𝐶 → ({𝐴, 𝐶} ∖ {𝐴}) = {𝐶})
21	19, 20	syl 17	. . . . . . 7 ⊢ (𝜑 → ({𝐴, 𝐶} ∖ {𝐴}) = {𝐶})
22	21	mpteq1d 5189	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷) = (𝑥 ∈ {𝐶} ↦ 𝐷))
23	18, 22	eqtr4d 2799	. . . . 5 ⊢ (𝜑 → {⟨𝐶, 𝐷⟩} = (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷))
24	14, 23	uneq12d 4122	. . . 4 ⊢ (𝜑 → ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩}) = ((𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵) ∪ (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷)))
25		partfun 6664	. . . 4 ⊢ (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 ∈ {𝐴}, 𝐵, 𝐷)) = ((𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵) ∪ (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷))
26	24, 25	eqtr4di 2814	. . 3 ⊢ (𝜑 → ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩}) = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 ∈ {𝐴}, 𝐵, 𝐷)))
27		elsn2g 4622	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ {𝐴} ↔ 𝑥 = 𝐴))
28	2, 27	syl 17	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ {𝐴} ↔ 𝑥 = 𝐴))
29	28	ifbid 4503	. . . 4 ⊢ (𝜑 → if(𝑥 ∈ {𝐴}, 𝐵, 𝐷) = if(𝑥 = 𝐴, 𝐵, 𝐷))
30	29	mpteq2dv 5193	. . 3 ⊢ (𝜑 → (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 ∈ {𝐴}, 𝐵, 𝐷)) = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))
31	26, 30	eqtrd 2796	. 2 ⊢ (𝜑 → ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩}) = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))
32	1, 31	eqtrid 2808	1 ⊢ (𝜑 → {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))

Syntax hints:   → wi 4   ↔ wb 208   = wceq 1559   ∈ wcel 2141   ≠ wne 2956   ∖ cdif 3901   ∪ cun 3902   ∩ cin 3903   ⊆ wss 3904  ifcif 4479  {csn 4581  {cpr 4583  ⟨cop 4587   ↦ cmpt 5180

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5245  ax-pr 5389

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-reu 3367  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-sn 4582  df-pr 4584  df-op 4588  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-fun 6519  df-fn 6520  df-f 6521  df-f1 6522  df-fo 6523  df-f1o 6524

This theorem is referenced by:  cycpm2tr  33260