Theorem offres 7968

Description: Pointwise combination commutes with restriction. (Contributed by Stefan O'Rear, 24-Jan-2015.)

Assertion

Ref	Expression
offres	⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝐹 ↾ 𝐷) ∘f 𝑅(𝐺 ↾ 𝐷)))

Proof of Theorem offres

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		elinel2 4157	. . . . 5 ⊢ (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) → 𝑥 ∈ 𝐷)
2		fvres 6890	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → ((𝐹 ↾ 𝐷)‘𝑥) = (𝐹‘𝑥))
3		fvres 6890	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → ((𝐺 ↾ 𝐷)‘𝑥) = (𝐺‘𝑥))
4	2, 3	oveq12d 7418	. . . . 5 ⊢ (𝑥 ∈ 𝐷 → (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥)) = ((𝐹‘𝑥)𝑅(𝐺‘𝑥)))
5	1, 4	syl 18	. . . 4 ⊢ (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) → (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥)) = ((𝐹‘𝑥)𝑅(𝐺‘𝑥)))
6	5	mpteq2ia 5199	. . 3 ⊢ (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) ↦ (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥))) = (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥)))
7		inindi 4189	. . . . 5 ⊢ (𝐷 ∩ (dom 𝐹 ∩ dom 𝐺)) = ((𝐷 ∩ dom 𝐹) ∩ (𝐷 ∩ dom 𝐺))
8		incom 4164	. . . . 5 ⊢ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) = (𝐷 ∩ (dom 𝐹 ∩ dom 𝐺))
9		dmres 6001	. . . . . 6 ⊢ dom (𝐹 ↾ 𝐷) = (𝐷 ∩ dom 𝐹)
10		dmres 6001	. . . . . 6 ⊢ dom (𝐺 ↾ 𝐷) = (𝐷 ∩ dom 𝐺)
11	9, 10	ineq12i 4173	. . . . 5 ⊢ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) = ((𝐷 ∩ dom 𝐹) ∩ (𝐷 ∩ dom 𝐺))
12	7, 8, 11	3eqtr4ri 2799	. . . 4 ⊢ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) = ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷)
13	12	mpteq1i 5195	. . 3 ⊢ (𝑥 ∈ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) ↦ (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥))) = (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) ↦ (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥)))
14		resmpt3 6030	. . 3 ⊢ ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))) ↾ 𝐷) = (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥)))
15	6, 13, 14	3eqtr4ri 2799	. 2 ⊢ ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))) ↾ 𝐷) = (𝑥 ∈ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) ↦ (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥)))
16		offval3 7967	. . 3 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → (𝐹 ∘f 𝑅𝐺) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))))
17	16	reseq1d 5967	. 2 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))) ↾ 𝐷))
18		resexg 6016	. . 3 ⊢ (𝐹 ∈ 𝑉 → (𝐹 ↾ 𝐷) ∈ V)
19		resexg 6016	. . 3 ⊢ (𝐺 ∈ 𝑊 → (𝐺 ↾ 𝐷) ∈ V)
20		offval3 7967	. . 3 ⊢ (((𝐹 ↾ 𝐷) ∈ V ∧ (𝐺 ↾ 𝐷) ∈ V) → ((𝐹 ↾ 𝐷) ∘f 𝑅(𝐺 ↾ 𝐷)) = (𝑥 ∈ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) ↦ (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥))))
21	18, 19, 20	syl2an 607	. 2 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ↾ 𝐷) ∘f 𝑅(𝐺 ↾ 𝐷)) = (𝑥 ∈ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) ↦ (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥))))
22	15, 17, 21	3eqtr4a 2826	1 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝐹 ↾ 𝐷) ∘f 𝑅(𝐺 ↾ 𝐷)))

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1563   ∈ wcel 2145  Vcvv 3457   ∩ cin 3906   ↦ cmpt 5185  dom cdm 5651   ↾ cres 5653  ‘cfv 6525  (class class class)co 7400   ∘_f cof 7662

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2737  ax-rep 5231  ax-sep 5250  ax-nul 5260  ax-pr 5394  ax-un 7722

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-nf 1807  df-sb 2094  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3080  df-rex 3090  df-reu 3371  df-rab 3418  df-v 3459  df-sbc 3748  df-csb 3856  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-nul 4289  df-if 4484  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-iun 4953  df-br 5105  df-opab 5167  df-mpt 5186  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6481  df-fun 6527  df-fn 6528  df-f 6529  df-f1 6530  df-fo 6531  df-f1o 6532  df-fv 6533  df-ov 7403  df-oprab 7404  df-mpo 7405  df-of 7664

This theorem is referenced by:  pwssplit2  21147  pwssplit3  21148  islindf4  21945  tsmsadd  24261  jensen  27107  ply1degltdimlem  33924  fdivmpt  49172