Theorem mptprop 30434

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 4570	. 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 6929	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {⟨𝐴, 𝐵⟩} = (𝑥 ∈ {𝐴} ↦ 𝐵))
5	2, 3, 4	syl2anc 586	. . . . . 6 ⊢ (𝜑 → {⟨𝐴, 𝐵⟩} = (𝑥 ∈ {𝐴} ↦ 𝐵))
6		incom 4178	. . . . . . . 8 ⊢ ({𝐴} ∩ {𝐴, 𝐶}) = ({𝐴, 𝐶} ∩ {𝐴})
7		prid1g 4696	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴, 𝐶})
8		snssi 4741	. . . . . . . . . 10 ⊢ (𝐴 ∈ {𝐴, 𝐶} → {𝐴} ⊆ {𝐴, 𝐶})
9	2, 7, 8	3syl 18	. . . . . . . . 9 ⊢ (𝜑 → {𝐴} ⊆ {𝐴, 𝐶})
10		df-ss 3952	. . . . . . . . 9 ⊢ ({𝐴} ⊆ {𝐴, 𝐶} ↔ ({𝐴} ∩ {𝐴, 𝐶}) = {𝐴})
11	9, 10	sylib 220	. . . . . . . 8 ⊢ (𝜑 → ({𝐴} ∩ {𝐴, 𝐶}) = {𝐴})
12	6, 11	syl5eqr 2870	. . . . . . 7 ⊢ (𝜑 → ({𝐴, 𝐶} ∩ {𝐴}) = {𝐴})
13	12	mpteq1d 5155	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵) = (𝑥 ∈ {𝐴} ↦ 𝐵))
14	5, 13	eqtr4d 2859	. . . . 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 6929	. . . . . . 7 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑊) → {⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐶} ↦ 𝐷))
18	15, 16, 17	syl2anc 586	. . . . . 6 ⊢ (𝜑 → {⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐶} ↦ 𝐷))
19		mptprop.1	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ≠ 𝐶)
20		difprsn1 4733	. . . . . . . 8 ⊢ (𝐴 ≠ 𝐶 → ({𝐴, 𝐶} ∖ {𝐴}) = {𝐶})
21	19, 20	syl 17	. . . . . . 7 ⊢ (𝜑 → ({𝐴, 𝐶} ∖ {𝐴}) = {𝐶})
22	21	mpteq1d 5155	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷) = (𝑥 ∈ {𝐶} ↦ 𝐷))
23	18, 22	eqtr4d 2859	. . . . 5 ⊢ (𝜑 → {⟨𝐶, 𝐷⟩} = (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷))
24	14, 23	uneq12d 4140	. . . 4 ⊢ (𝜑 → ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩}) = ((𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵) ∪ (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷)))
25		partfun 30421	. . . 4 ⊢ (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 ∈ {𝐴}, 𝐵, 𝐷)) = ((𝑥 ∈ ({𝐴, 𝐶} ∩ {𝐴}) ↦ 𝐵) ∪ (𝑥 ∈ ({𝐴, 𝐶} ∖ {𝐴}) ↦ 𝐷))
26	24, 25	syl6eqr 2874	. . 3 ⊢ (𝜑 → ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩}) = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 ∈ {𝐴}, 𝐵, 𝐷)))
27		elsn2g 4603	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ {𝐴} ↔ 𝑥 = 𝐴))
28	2, 27	syl 17	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ {𝐴} ↔ 𝑥 = 𝐴))
29	28	ifbid 4489	. . . 4 ⊢ (𝜑 → if(𝑥 ∈ {𝐴}, 𝐵, 𝐷) = if(𝑥 = 𝐴, 𝐵, 𝐷))
30	29	mpteq2dv 5162	. . 3 ⊢ (𝜑 → (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 ∈ {𝐴}, 𝐵, 𝐷)) = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))
31	26, 30	eqtrd 2856	. 2 ⊢ (𝜑 → ({⟨𝐴, 𝐵⟩} ∪ {⟨𝐶, 𝐷⟩}) = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))
32	1, 31	syl5eq 2868	1 ⊢ (𝜑 → {⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩} = (𝑥 ∈ {𝐴, 𝐶} ↦ if(𝑥 = 𝐴, 𝐵, 𝐷)))

Syntax hints:   → wi 4   ↔ wb 208   = wceq 1537   ∈ wcel 2114   ≠ wne 3016   ∖ cdif 3933   ∪ cun 3934   ∩ cin 3935   ⊆ wss 3936  ifcif 4467  {csn 4567  {cpr 4569  ⟨cop 4573   ↦ cmpt 5146

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pr 5330

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-br 5067  df-opab 5129  df-mpt 5147  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362

This theorem is referenced by:  cycpm2tr  30761