Theorem offres 7980

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 4163	. . . . 5 ⊢ (𝑥 ∈ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) → 𝑥 ∈ 𝐷)
2		fvres 6901	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → ((𝐹 ↾ 𝐷)‘𝑥) = (𝐹‘𝑥))
3		fvres 6901	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → ((𝐺 ↾ 𝐷)‘𝑥) = (𝐺‘𝑥))
4	2, 3	oveq12d 7429	. . . . 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 5210	. . 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 4195	. . . . 5 ⊢ (𝐷 ∩ (dom 𝐹 ∩ dom 𝐺)) = ((𝐷 ∩ dom 𝐹) ∩ (𝐷 ∩ dom 𝐺))
8		incom 4170	. . . . 5 ⊢ ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷) = (𝐷 ∩ (dom 𝐹 ∩ dom 𝐺))
9		dmres 6012	. . . . . 6 ⊢ dom (𝐹 ↾ 𝐷) = (𝐷 ∩ dom 𝐹)
10		dmres 6012	. . . . . 6 ⊢ dom (𝐺 ↾ 𝐷) = (𝐷 ∩ dom 𝐺)
11	9, 10	ineq12i 4179	. . . . 5 ⊢ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) = ((𝐷 ∩ dom 𝐹) ∩ (𝐷 ∩ dom 𝐺))
12	7, 8, 11	3eqtr4ri 2803	. . . 4 ⊢ (dom (𝐹 ↾ 𝐷) ∩ dom (𝐺 ↾ 𝐷)) = ((dom 𝐹 ∩ dom 𝐺) ∩ 𝐷)
13	12	mpteq1i 5206	. . 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 6041	. . 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 2803	. 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 7979	. . 3 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → (𝐹 ∘f 𝑅𝐺) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))))
17	16	reseq1d 5978	. 2 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥)𝑅(𝐺‘𝑥))) ↾ 𝐷))
18		resexg 6027	. . 3 ⊢ (𝐹 ∈ 𝑉 → (𝐹 ↾ 𝐷) ∈ V)
19		resexg 6027	. . 3 ⊢ (𝐺 ∈ 𝑊 → (𝐺 ↾ 𝐷) ∈ V)
20		offval3 7979	. . 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 2830	1 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐺 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) ↾ 𝐷) = ((𝐹 ↾ 𝐷) ∘f 𝑅(𝐺 ↾ 𝐷)))

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1567   ∈ wcel 2149  Vcvv 3463   ∩ cin 3912   ↦ cmpt 5196  dom cdm 5662   ↾ cres 5664  ‘cfv 6537  (class class class)co 7411   ∘_f cof 7673

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-rep 5242  ax-sep 5261  ax-nul 5271  ax-pr 5405  ax-un 7733

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-reu 3377  df-rab 3424  df-v 3465  df-sbc 3754  df-csb 3862  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-iun 4962  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5557  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-ima 5675  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-ov 7414  df-oprab 7415  df-mpo 7416  df-of 7675

This theorem is referenced by:  pwssplit2  21159  pwssplit3  21160  islindf4  21957  tsmsadd  24273  jensen  27119  ply1degltdimlem  33957  fdivmpt  49205