Theorem fvproj 8078

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 7364	. 2 ⊢ (𝑋𝐻𝑌) = (𝐻‘⟨𝑋, 𝑌⟩)
2		fvproj.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐴)
3		fvproj.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
4		fveq2 6835	. . . . 5 ⊢ (𝑎 = 𝑋 → (𝐹‘𝑎) = (𝐹‘𝑋))
5	4	opeq1d 4823	. . . 4 ⊢ (𝑎 = 𝑋 → ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩ = ⟨(𝐹‘𝑋), (𝐺‘𝑏)⟩)
6		fveq2 6835	. . . . 5 ⊢ (𝑏 = 𝑌 → (𝐺‘𝑏) = (𝐺‘𝑌))
7	6	opeq2d 4824	. . . 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 6835	. . . . . . 7 ⊢ (𝑥 = 𝑎 → (𝐹‘𝑥) = (𝐹‘𝑎))
10	9	opeq1d 4823	. . . . . 6 ⊢ (𝑥 = 𝑎 → ⟨(𝐹‘𝑥), (𝐺‘𝑦)⟩ = ⟨(𝐹‘𝑎), (𝐺‘𝑦)⟩)
11		fveq2 6835	. . . . . . 7 ⊢ (𝑦 = 𝑏 → (𝐺‘𝑦) = (𝐺‘𝑏))
12	11	opeq2d 4824	. . . . . 6 ⊢ (𝑦 = 𝑏 → ⟨(𝐹‘𝑎), (𝐺‘𝑦)⟩ = ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩)
13	10, 12	cbvmpov 7456	. . . . 5 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ ⟨(𝐹‘𝑥), (𝐺‘𝑦)⟩) = (𝑎 ∈ 𝐴, 𝑏 ∈ 𝐵 ↦ ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩)
14	8, 13	eqtri 2760	. . . 4 ⊢ 𝐻 = (𝑎 ∈ 𝐴, 𝑏 ∈ 𝐵 ↦ ⟨(𝐹‘𝑎), (𝐺‘𝑏)⟩)
15		opex 5412	. . . 4 ⊢ ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩ ∈ V
16	5, 7, 14, 15	ovmpo 7521	. . 3 ⊢ ((𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐵) → (𝑋𝐻𝑌) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)
17	2, 3, 16	syl2anc 585	. 2 ⊢ (𝜑 → (𝑋𝐻𝑌) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)
18	1, 17	eqtr3id 2786	1 ⊢ (𝜑 → (𝐻‘⟨𝑋, 𝑌⟩) = ⟨(𝐹‘𝑋), (𝐺‘𝑌)⟩)

Syntax hints:   → wi 4   = wceq 1542   ∈ wcel 2114  ⟨cop 4574  ‘cfv 6493  (class class class)co 7361   ∈ cmpo 7363

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5232  ax-pr 5371

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-sbc 3730  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-iota 6449  df-fun 6495  df-fv 6501  df-ov 7364  df-oprab 7365  df-mpo 7366

This theorem is referenced by:  fimaproj  8079  ex-fpar  30550  qtophaus  33999