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Theorem shftfn 10788
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 𝐵𝐴 ∈ ℂ) → (𝐹 shift 𝐴) Fn {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ 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.
StepHypRef Expression
1 relopab 4738 . . . . 5 Rel {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}
21a1i 9 . . . 4 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → Rel {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)})
3 fnfun 5295 . . . . . 6 (𝐹 Fn 𝐵 → Fun 𝐹)
43adantr 274 . . . . 5 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → Fun 𝐹)
5 funmo 5213 . . . . . . 7 (Fun 𝐹 → ∃*𝑤(𝑧𝐴)𝐹𝑤)
6 vex 2733 . . . . . . . . . 10 𝑧 ∈ V
7 vex 2733 . . . . . . . . . 10 𝑤 ∈ V
8 eleq1 2233 . . . . . . . . . . 11 (𝑥 = 𝑧 → (𝑥 ∈ ℂ ↔ 𝑧 ∈ ℂ))
9 oveq1 5860 . . . . . . . . . . . 12 (𝑥 = 𝑧 → (𝑥𝐴) = (𝑧𝐴))
109breq1d 3999 . . . . . . . . . . 11 (𝑥 = 𝑧 → ((𝑥𝐴)𝐹𝑦 ↔ (𝑧𝐴)𝐹𝑦))
118, 10anbi12d 470 . . . . . . . . . 10 (𝑥 = 𝑧 → ((𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦) ↔ (𝑧 ∈ ℂ ∧ (𝑧𝐴)𝐹𝑦)))
12 breq2 3993 . . . . . . . . . . 11 (𝑦 = 𝑤 → ((𝑧𝐴)𝐹𝑦 ↔ (𝑧𝐴)𝐹𝑤))
1312anbi2d 461 . . . . . . . . . 10 (𝑦 = 𝑤 → ((𝑧 ∈ ℂ ∧ (𝑧𝐴)𝐹𝑦) ↔ (𝑧 ∈ ℂ ∧ (𝑧𝐴)𝐹𝑤)))
14 eqid 2170 . . . . . . . . . 10 {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}
156, 7, 11, 13, 14brab 4257 . . . . . . . . 9 (𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤 ↔ (𝑧 ∈ ℂ ∧ (𝑧𝐴)𝐹𝑤))
1615simprbi 273 . . . . . . . 8 (𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤 → (𝑧𝐴)𝐹𝑤)
1716moimi 2084 . . . . . . 7 (∃*𝑤(𝑧𝐴)𝐹𝑤 → ∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤)
185, 17syl 14 . . . . . 6 (Fun 𝐹 → ∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤)
1918alrimiv 1867 . . . . 5 (Fun 𝐹 → ∀𝑧∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤)
204, 19syl 14 . . . 4 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → ∀𝑧∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤)
21 dffun6 5212 . . . 4 (Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)} ↔ (Rel {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)} ∧ ∀𝑧∃*𝑤 𝑧{⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}𝑤))
222, 20, 21sylanbrc 415 . . 3 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)})
23 shftfval.1 . . . . . 6 𝐹 ∈ V
2423shftfval 10785 . . . . 5 (𝐴 ∈ ℂ → (𝐹 shift 𝐴) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)})
2524adantl 275 . . . 4 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → (𝐹 shift 𝐴) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)})
2625funeqd 5220 . . 3 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → (Fun (𝐹 shift 𝐴) ↔ Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ℂ ∧ (𝑥𝐴)𝐹𝑦)}))
2722, 26mpbird 166 . 2 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → Fun (𝐹 shift 𝐴))
2823shftdm 10786 . . 3 (𝐴 ∈ ℂ → dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ dom 𝐹})
29 fndm 5297 . . . . 5 (𝐹 Fn 𝐵 → dom 𝐹 = 𝐵)
3029eleq2d 2240 . . . 4 (𝐹 Fn 𝐵 → ((𝑥𝐴) ∈ dom 𝐹 ↔ (𝑥𝐴) ∈ 𝐵))
3130rabbidv 2719 . . 3 (𝐹 Fn 𝐵 → {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ dom 𝐹} = {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ 𝐵})
3228, 31sylan9eqr 2225 . 2 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ 𝐵})
33 df-fn 5201 . 2 ((𝐹 shift 𝐴) Fn {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ 𝐵} ↔ (Fun (𝐹 shift 𝐴) ∧ dom (𝐹 shift 𝐴) = {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ 𝐵}))
3427, 32, 33sylanbrc 415 1 ((𝐹 Fn 𝐵𝐴 ∈ ℂ) → (𝐹 shift 𝐴) Fn {𝑥 ∈ ℂ ∣ (𝑥𝐴) ∈ 𝐵})
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wal 1346   = wceq 1348  ∃*wmo 2020  wcel 2141  {crab 2452  Vcvv 2730   class class class wbr 3989  {copab 4049  dom cdm 4611  Rel wrel 4616  Fun wfun 5192   Fn wfn 5193  (class class class)co 5853  cc 7772  cmin 8090   shift cshi 10778
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-resscn 7866  ax-1cn 7867  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-addcom 7874  ax-addass 7876  ax-distr 7878  ax-i2m1 7879  ax-0id 7882  ax-rnegex 7883  ax-cnre 7885
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-sub 8092  df-shft 10779
This theorem is referenced by:  shftf  10794  seq3shft  10802
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