Theorem shftfn 11054

Description: Functionality and domain of a sequence shifted by 𝐴. (Contributed by NM, 20-Jul-2005.) (Revised by Mario Carneiro, 3-Nov-2013.)

Hypothesis

Ref	Expression
shftfval.1	⊢ 𝐹 ∈ V

Assertion

Ref	Expression
shftfn	⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → (𝐹 shift 𝐴) Fn {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵})

Distinct variable groups:   𝑥,𝐴   𝑥,𝐹   𝑥,𝐵

Proof of Theorem shftfn

Dummy variables 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		relopab 4802	. . . . 5 ⊢ Rel {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}
2	1	a1i 9	. . . 4 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → Rel {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)})
3		fnfun 5365	. . . . . 6 ⊢ (𝐹 Fn 𝐵 → Fun 𝐹)
4	3	adantr 276	. . . . 5 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → Fun 𝐹)
5		funmo 5283	. . . . . . 7 ⊢ (Fun 𝐹 → ∃*𝑤(𝑧 − 𝐴)𝐹𝑤)
6		vex 2774	. . . . . . . . . 10 ⊢ 𝑧 ∈ V
7		vex 2774	. . . . . . . . . 10 ⊢ 𝑤 ∈ V
8		eleq1 2267	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑧 → (𝑥 ∈ ℂ ↔ 𝑧 ∈ ℂ))
9		oveq1 5941	. . . . . . . . . . . 12 ⊢ (𝑥 = 𝑧 → (𝑥 − 𝐴) = (𝑧 − 𝐴))
10	9	breq1d 4053	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑧 → ((𝑥 − 𝐴)𝐹𝑦 ↔ (𝑧 − 𝐴)𝐹𝑦))
11	8, 10	anbi12d 473	. . . . . . . . . 10 ⊢ (𝑥 = 𝑧 → ((𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦) ↔ (𝑧 ∈ ℂ ∧ (𝑧 − 𝐴)𝐹𝑦)))
12		breq2 4047	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑤 → ((𝑧 − 𝐴)𝐹𝑦 ↔ (𝑧 − 𝐴)𝐹𝑤))
13	12	anbi2d 464	. . . . . . . . . 10 ⊢ (𝑦 = 𝑤 → ((𝑧 ∈ ℂ ∧ (𝑧 − 𝐴)𝐹𝑦) ↔ (𝑧 ∈ ℂ ∧ (𝑧 − 𝐴)𝐹𝑤)))
14		eqid 2204	. . . . . . . . . 10 ⊢ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}
15	6, 7, 11, 13, 14	brab 4317	. . . . . . . . 9 ⊢ (𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤 ↔ (𝑧 ∈ ℂ ∧ (𝑧 − 𝐴)𝐹𝑤))
16	15	simprbi 275	. . . . . . . 8 ⊢ (𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤 → (𝑧 − 𝐴)𝐹𝑤)
17	16	moimi 2118	. . . . . . 7 ⊢ (∃*𝑤(𝑧 − 𝐴)𝐹𝑤 → ∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤)
18	5, 17	syl 14	. . . . . 6 ⊢ (Fun 𝐹 → ∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤)
19	18	alrimiv 1896	. . . . 5 ⊢ (Fun 𝐹 → ∀𝑧∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤)
20	4, 19	syl 14	. . . 4 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → ∀𝑧∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤)
21		dffun6 5282	. . . 4 ⊢ (Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)} ↔ (Rel {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)} ∧ ∀𝑧∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}𝑤))
22	2, 20, 21	sylanbrc 417	. . 3 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)})
23		shftfval.1	. . . . . 6 ⊢ 𝐹 ∈ V
24	23	shftfval 11051	. . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐹 shift 𝐴) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)})
25	24	adantl 277	. . . 4 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → (𝐹 shift 𝐴) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)})
26	25	funeqd 5290	. . 3 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → (Fun (𝐹 shift 𝐴) ↔ Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}))
27	22, 26	mpbird 167	. 2 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → Fun (𝐹 shift 𝐴))
28	23	shftdm 11052	. . 3 ⊢ (𝐴 ∈ ℂ → dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ dom 𝐹})
29		fndm 5367	. . . . 5 ⊢ (𝐹 Fn 𝐵 → dom 𝐹 = 𝐵)
30	29	eleq2d 2274	. . . 4 ⊢ (𝐹 Fn 𝐵 → ((𝑥 − 𝐴) ∈ dom 𝐹 ↔ (𝑥 − 𝐴) ∈ 𝐵))
31	30	rabbidv 2760	. . 3 ⊢ (𝐹 Fn 𝐵 → {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ dom 𝐹} = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵})
32	28, 31	sylan9eqr 2259	. 2 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵})
33		df-fn 5271	. 2 ⊢ ((𝐹 shift 𝐴) Fn {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵} ↔ (Fun (𝐹 shift 𝐴) ∧ dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵}))
34	27, 32, 33	sylanbrc 417	1 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → (𝐹 shift 𝐴) Fn {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵})

Syntax hints:   → wi 4   ∧ wa 104  ∀wal 1370   = wceq 1372  ∃*wmo 2054   ∈ wcel 2175  {crab 2487  Vcvv 2771   class class class wbr 4043  {copab 4103  dom cdm 4673  Rel wrel 4678  Fun wfun 5262   Fn wfn 5263  (class class class)co 5934  ℂcc 7905   − cmin 8225   shift cshi 11044

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-13 2177  ax-14 2178  ax-ext 2186  ax-coll 4158  ax-sep 4161  ax-pow 4217  ax-pr 4252  ax-un 4478  ax-setind 4583  ax-resscn 7999  ax-1cn 8000  ax-icn 8002  ax-addcl 8003  ax-addrcl 8004  ax-mulcl 8005  ax-addcom 8007  ax-addass 8009  ax-distr 8011  ax-i2m1 8012  ax-0id 8015  ax-rnegex 8016  ax-cnre 8018

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-fal 1378  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ne 2376  df-ral 2488  df-rex 2489  df-reu 2490  df-rab 2492  df-v 2773  df-sbc 2998  df-csb 3093  df-dif 3167  df-un 3169  df-in 3171  df-ss 3178  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-uni 3850  df-iun 3928  df-br 4044  df-opab 4105  df-mpt 4106  df-id 4338  df-xp 4679  df-rel 4680  df-cnv 4681  df-co 4682  df-dm 4683  df-rn 4684  df-res 4685  df-ima 4686  df-iota 5229  df-fun 5270  df-fn 5271  df-f 5272  df-f1 5273  df-fo 5274  df-f1o 5275  df-fv 5276  df-riota 5889  df-ov 5937  df-oprab 5938  df-mpo 5939  df-sub 8227  df-shft 11045

This theorem is referenced by:  shftf  11060  seq3shft  11068