Theorem mpoeq123i 7223

Description: An equality inference for the maps-to notation. (Contributed by NM, 15-Jul-2013.)

Hypotheses

Ref	Expression
mpoeq123i.1	⊢ 𝐴 = 𝐷
mpoeq123i.2	⊢ 𝐵 = 𝐸
mpoeq123i.3	⊢ 𝐶 = 𝐹

Assertion

Ref	Expression
mpoeq123i	⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶) = (𝑥 ∈ 𝐷, 𝑦 ∈ 𝐸 ↦ 𝐹)

Proof of Theorem mpoeq123i

Step	Hyp	Ref	Expression
1		mpoeq123i.1	. . . 4 ⊢ 𝐴 = 𝐷
2	1	a1i 11	. . 3 ⊢ (⊤ → 𝐴 = 𝐷)
3		mpoeq123i.2	. . . 4 ⊢ 𝐵 = 𝐸
4	3	a1i 11	. . 3 ⊢ (⊤ → 𝐵 = 𝐸)
5		mpoeq123i.3	. . . 4 ⊢ 𝐶 = 𝐹
6	5	a1i 11	. . 3 ⊢ (⊤ → 𝐶 = 𝐹)
7	2, 4, 6	mpoeq123dv 7222	. 2 ⊢ (⊤ → (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶) = (𝑥 ∈ 𝐷, 𝑦 ∈ 𝐸 ↦ 𝐹))
8	7	mptru 1543	1 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶) = (𝑥 ∈ 𝐷, 𝑦 ∈ 𝐸 ↦ 𝐹)

Syntax hints:   = wceq 1536  ⊤wtru 1537   ∈ cmpo 7151

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-12 2176  ax-ext 2792

This theorem depends on definitions:  df-bi 209  df-an 399  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-clab 2799  df-cleq 2813  df-clel 2892  df-oprab 7153  df-mpo 7154

This theorem is referenced by:  ofmres  7678  seqval  13377  oppgtmd  22698  wlkson  27434  mdetlap1  31113  sdc  35053  tgrpset  37915  mendvscafval  39867  fsovcnvlem  40434  hspmbl  42986