Theorem shftfn 11384

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 4856	. . . . 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 5427	. . . . . 6 ⊢ (𝐹 Fn 𝐵 → Fun 𝐹)
4	3	adantr 276	. . . . 5 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → Fun 𝐹)
5		funmo 5341	. . . . . . 7 ⊢ (Fun 𝐹 → ∃*𝑤(𝑧 − 𝐴)𝐹𝑤)
6		vex 2805	. . . . . . . . . 10 ⊢ 𝑧 ∈ V
7		vex 2805	. . . . . . . . . 10 ⊢ 𝑤 ∈ V
8		eleq1 2294	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑧 → (𝑥 ∈ ℂ ↔ 𝑧 ∈ ℂ))
9		oveq1 6024	. . . . . . . . . . . 12 ⊢ (𝑥 = 𝑧 → (𝑥 − 𝐴) = (𝑧 − 𝐴))
10	9	breq1d 4098	. . . . . . . . . . 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 4092	. . . . . . . . . . 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 2231	. . . . . . . . . 10 ⊢ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥 − 𝐴)𝐹𝑦)}
15	6, 7, 11, 13, 14	brab 4367	. . . . . . . . 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 2145	. . . . . . 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 1922	. . . . 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 5340	. . . 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 11381	. . . . 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 5348	. . 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 11382	. . 3 ⊢ (𝐴 ∈ ℂ → dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ dom 𝐹})
29		fndm 5429	. . . . 5 ⊢ (𝐹 Fn 𝐵 → dom 𝐹 = 𝐵)
30	29	eleq2d 2301	. . . 4 ⊢ (𝐹 Fn 𝐵 → ((𝑥 − 𝐴) ∈ dom 𝐹 ↔ (𝑥 − 𝐴) ∈ 𝐵))
31	30	rabbidv 2791	. . 3 ⊢ (𝐹 Fn 𝐵 → {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ dom 𝐹} = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵})
32	28, 31	sylan9eqr 2286	. 2 ⊢ ((𝐹 Fn 𝐵 ∧ 𝐴 ∈ ℂ) → dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥 − 𝐴) ∈ 𝐵})
33		df-fn 5329	. 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 1395   = wceq 1397  ∃*wmo 2080   ∈ wcel 2202  {crab 2514  Vcvv 2802   class class class wbr 4088  {copab 4149  dom cdm 4725  Rel wrel 4730  Fun wfun 5320   Fn wfn 5321  (class class class)co 6017  ℂcc 8029   − cmin 8349   shift cshi 11374

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-resscn 8123  ax-1cn 8124  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-addcom 8131  ax-addass 8133  ax-distr 8135  ax-i2m1 8136  ax-0id 8139  ax-rnegex 8140  ax-cnre 8142

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-sub 8351  df-shft 11375

This theorem is referenced by:  shftf  11390  seq3shft  11398