Theorem offres 8008

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 4202	. . . . 5 ⊢ (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) → 𝑥 ∈ 𝐷)
2		fvres 6925	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → ((𝐹 ↾ 𝐷)‘𝑥) = (𝐹‘𝑥))
3		fvres 6925	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → ((𝐺 ↾ 𝐷)‘𝑥) = (𝐺‘𝑥))
4	2, 3	oveq12d 7449	. . . . 5 ⊢ (𝑥 ∈ 𝐷 → (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥)) = ((𝐹‘𝑥)𝑅(𝐺‘𝑥)))
5	1, 4	syl 17	. . . 4 ⊢ (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) → (((𝐹 ↾ 𝐷)‘𝑥)𝑅((𝐺 ↾ 𝐷)‘𝑥)) = ((𝐹‘𝑥)𝑅(𝐺‘𝑥)))
6	5	mpteq2ia 5245	. . 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 4235	. . . . 5 ⊢ (𝐷 ∩ (dom 𝐹 ∩ dom 𝐺)) = ((𝐷 ∩ dom 𝐹) ∩ (𝐷 ∩ dom 𝐺))
8		incom 4209	. . . . 5 ⊢ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) = (𝐷 ∩ (dom 𝐹 ∩ dom 𝐺))
9		dmres 6030	. . . . . 6 ⊢ dom (𝐹 ↾ 𝐷) = (𝐷 ∩ dom 𝐹)
10		dmres 6030	. . . . . 6 ⊢ dom (𝐺 ↾ 𝐷) = (𝐷 ∩ dom 𝐺)
11	9, 10	ineq12i 4218	. . . . 5 ⊢ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) = ((𝐷 ∩ dom 𝐹) ∩ (𝐷 ∩ dom 𝐺))
12	7, 8, 11	3eqtr4ri 2776	. . . 4 ⊢ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) = ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷)
13	12	mpteq1i 5238	. . 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 6056	. . 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 2776	. 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 8007	. . 3 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → (𝐹 ∘f 𝑅𝐺) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))))
17	16	reseq1d 5996	. 2 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))) ↾ 𝐷))
18		resexg 6045	. . 3 ⊢ (𝐹 ∈ 𝑉 → (𝐹 ↾ 𝐷) ∈ V)
19		resexg 6045	. . 3 ⊢ (𝐺 ∈ 𝑊 → (𝐺 ↾ 𝐷) ∈ V)
20		offval3 8007	. . 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 596	. 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 2803	1 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝐹 ↾ 𝐷) ∘f 𝑅(𝐺 ↾ 𝐷)))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2108  Vcvv 3480   ∩ cin 3950   ↦ cmpt 5225  dom cdm 5685   ↾ cres 5687  ‘cfv 6561  (class class class)co 7431   ∘_f cof 7695

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 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-rep 5279  ax-sep 5296  ax-nul 5306  ax-pr 5432  ax-un 7755

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3381  df-rab 3437  df-v 3482  df-sbc 3789  df-csb 3900  df-dif 3954  df-un 3956  df-in 3958  df-ss 3968  df-nul 4334  df-if 4526  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-iun 4993  df-br 5144  df-opab 5206  df-mpt 5226  df-id 5578  df-xp 5691  df-rel 5692  df-cnv 5693  df-co 5694  df-dm 5695  df-rn 5696  df-res 5697  df-ima 5698  df-iota 6514  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-ov 7434  df-oprab 7435  df-mpo 7436  df-of 7697

This theorem is referenced by:  pwssplit2  21059  pwssplit3  21060  islindf4  21858  tsmsadd  24155  jensen  27032  ply1degltdimlem  33673  fdivmpt  48461