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Theorem fvproj 29023
 Description: Value of a function on pairs, given two projections 𝐹 and 𝐺. (Contributed by Thierry Arnoux, 30-Dec-2019.)
Hypotheses
Ref Expression
fvproj.h 𝐻 = (𝑥𝐴, 𝑦𝐵 ↦ ⟨(𝐹𝑥), (𝐺𝑦)⟩)
fvproj.x (𝜑𝑋𝐴)
fvproj.y (𝜑𝑌𝐵)
Assertion
Ref Expression
fvproj (𝜑 → (𝐻‘⟨𝑋, 𝑌⟩) = ⟨(𝐹𝑋), (𝐺𝑌)⟩)
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.
StepHypRef Expression
1 df-ov 6429 . 2 (𝑋𝐻𝑌) = (𝐻‘⟨𝑋, 𝑌⟩)
2 fvproj.x . . 3 (𝜑𝑋𝐴)
3 fvproj.y . . 3 (𝜑𝑌𝐵)
4 fveq2 5987 . . . . 5 (𝑎 = 𝑋 → (𝐹𝑎) = (𝐹𝑋))
54opeq1d 4244 . . . 4 (𝑎 = 𝑋 → ⟨(𝐹𝑎), (𝐺𝑏)⟩ = ⟨(𝐹𝑋), (𝐺𝑏)⟩)
6 fveq2 5987 . . . . 5 (𝑏 = 𝑌 → (𝐺𝑏) = (𝐺𝑌))
76opeq2d 4245 . . . 4 (𝑏 = 𝑌 → ⟨(𝐹𝑋), (𝐺𝑏)⟩ = ⟨(𝐹𝑋), (𝐺𝑌)⟩)
8 fvproj.h . . . . 5 𝐻 = (𝑥𝐴, 𝑦𝐵 ↦ ⟨(𝐹𝑥), (𝐺𝑦)⟩)
9 fveq2 5987 . . . . . . 7 (𝑥 = 𝑎 → (𝐹𝑥) = (𝐹𝑎))
109opeq1d 4244 . . . . . 6 (𝑥 = 𝑎 → ⟨(𝐹𝑥), (𝐺𝑦)⟩ = ⟨(𝐹𝑎), (𝐺𝑦)⟩)
11 fveq2 5987 . . . . . . 7 (𝑦 = 𝑏 → (𝐺𝑦) = (𝐺𝑏))
1211opeq2d 4245 . . . . . 6 (𝑦 = 𝑏 → ⟨(𝐹𝑎), (𝐺𝑦)⟩ = ⟨(𝐹𝑎), (𝐺𝑏)⟩)
1310, 12cbvmpt2v 6510 . . . . 5 (𝑥𝐴, 𝑦𝐵 ↦ ⟨(𝐹𝑥), (𝐺𝑦)⟩) = (𝑎𝐴, 𝑏𝐵 ↦ ⟨(𝐹𝑎), (𝐺𝑏)⟩)
148, 13eqtri 2536 . . . 4 𝐻 = (𝑎𝐴, 𝑏𝐵 ↦ ⟨(𝐹𝑎), (𝐺𝑏)⟩)
15 opex 4757 . . . 4 ⟨(𝐹𝑋), (𝐺𝑌)⟩ ∈ V
165, 7, 14, 15ovmpt2 6571 . . 3 ((𝑋𝐴𝑌𝐵) → (𝑋𝐻𝑌) = ⟨(𝐹𝑋), (𝐺𝑌)⟩)
172, 3, 16syl2anc 690 . 2 (𝜑 → (𝑋𝐻𝑌) = ⟨(𝐹𝑋), (𝐺𝑌)⟩)
181, 17syl5eqr 2562 1 (𝜑 → (𝐻‘⟨𝑋, 𝑌⟩) = ⟨(𝐹𝑋), (𝐺𝑌)⟩)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   = wceq 1474   ∈ wcel 1938  ⟨cop 4034  ‘cfv 5689  (class class class)co 6426   ↦ cmpt2 6428 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1700  ax-4 1713  ax-5 1793  ax-6 1838  ax-7 1885  ax-9 1947  ax-10 1966  ax-11 1971  ax-12 1983  ax-13 2137  ax-ext 2494  ax-sep 4607  ax-nul 4616  ax-pr 4732 This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1699  df-sb 1831  df-eu 2366  df-mo 2367  df-clab 2501  df-cleq 2507  df-clel 2510  df-nfc 2644  df-ral 2805  df-rex 2806  df-rab 2809  df-v 3079  df-sbc 3307  df-dif 3447  df-un 3449  df-in 3451  df-ss 3458  df-nul 3778  df-if 3940  df-sn 4029  df-pr 4031  df-op 4035  df-uni 4271  df-br 4482  df-opab 4542  df-id 4847  df-xp 4938  df-rel 4939  df-cnv 4940  df-co 4941  df-dm 4942  df-iota 5653  df-fun 5691  df-fv 5697  df-ov 6429  df-oprab 6430  df-mpt2 6431 This theorem is referenced by:  fimaproj  29024  qtophaus  29027
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