Theorem fvproj 8136

Description: Value of a function on ordered pairs with values expressed as ordered pairs. Note that 𝐹 and 𝐺 are the projections of 𝐻 to the first and second coordinate respectively. (Contributed by Thierry Arnoux, 30-Dec-2019.)

Hypotheses

Ref	Expression
fvproj.h	⊢ 𝐻 = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ ⟨(𝐹‘𝑥), (𝐺‘𝑦)⟩)
fvproj.x	⊢ (𝜑 → 𝑋 ∈ 𝐴)
fvproj.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)

Assertion

Ref	Expression
fvproj	⊢ (𝜑 → (𝐻‘⟨𝑋, 𝑌⟩) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)

Distinct variable groups:   𝑥,𝐴,𝑦   𝑥,𝐵,𝑦   𝑥,𝐹,𝑦   𝑥,𝐺,𝑦

Allowed substitution hints:   𝜑(𝑥, 𝑦)   𝐻(𝑥, 𝑦)   𝑋(𝑥, 𝑦)   𝑌(𝑥, 𝑦)

Proof of Theorem fvproj

Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-ov 7422	. 2 ⊢ (𝑋𝐻𝑌) = (𝐻‘⟨𝑋, 𝑌⟩)
2		fvproj.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐴)
3		fvproj.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
4		fveq2 6885	. . . . 5 ⊢ (𝑎 = 𝑋 → (𝐹‘𝑎) = (𝐹‘𝑋))
5	4	opeq1d 4846	. . . 4 ⊢ (𝑎 = 𝑋 → ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩ = ⟨(𝐹‘𝑋), (𝐺‘𝑏)⟩)
6		fveq2 6885	. . . . 5 ⊢ (𝑏 = 𝑌 → (𝐺‘𝑏) = (𝐺‘𝑌))
7	6	opeq2d 4847	. . . 4 ⊢ (𝑏 = 𝑌 → ⟨(𝐹‘𝑋), (𝐺‘𝑏)⟩ = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)
8		fvproj.h	. . . . 5 ⊢ 𝐻 = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ ⟨(𝐹‘𝑥), (𝐺‘𝑦)⟩)
9		fveq2 6885	. . . . . . 7 ⊢ (𝑥 = 𝑎 → (𝐹‘𝑥) = (𝐹‘𝑎))
10	9	opeq1d 4846	. . . . . 6 ⊢ (𝑥 = 𝑎 → ⟨(𝐹‘𝑥), (𝐺‘𝑦)⟩ = ⟨(𝐹‘𝑎), (𝐺‘𝑦)⟩)
11		fveq2 6885	. . . . . . 7 ⊢ (𝑦 = 𝑏 → (𝐺‘𝑦) = (𝐺‘𝑏))
12	11	opeq2d 4847	. . . . . 6 ⊢ (𝑦 = 𝑏 → ⟨(𝐹‘𝑎), (𝐺‘𝑦)⟩ = ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩)
13	10, 12	cbvmpov 7514	. . . . 5 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ ⟨(𝐹‘𝑥), (𝐺‘𝑦)⟩) = (𝑎 ∈ 𝐴, 𝑏 ∈ 𝐵 ↦ ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩)
14	8, 13	eqtri 2788	. . . 4 ⊢ 𝐻 = (𝑎 ∈ 𝐴, 𝑏 ∈ 𝐵 ↦ ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩)
15		opex 5447	. . . 4 ⊢ ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩ ∈ V
16	5, 7, 14, 15	ovmpo 7579	. . 3 ⊢ ((𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐵) → (𝑋𝐻𝑌) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)
17	2, 3, 16	syl2anc 596	. 2 ⊢ (𝜑 → (𝑋𝐻𝑌) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)
18	1, 17	eqtr3id 2814	1 ⊢ (𝜑 → (𝐻‘⟨𝑋, 𝑌⟩) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)

This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2146  ⟨cop 4597  ‘cfv 6540  (class class class)co 7419   ∈ cmpo 7421

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-sep 5259  ax-pr 5406

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-sbc 3747  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-br 5112  df-opab 5176  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-iota 6496  df-fun 6542  df-fv 6548  df-ov 7422  df-oprab 7423  df-mpo 7424

This theorem is used by:  fimaproj  8137  ex-fpar  30884  qtophaus  34290