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Theorem swrdval 14000
 Description: Value of a subword. (Contributed by Stefan O'Rear, 15-Aug-2015.)
Assertion
Ref Expression
swrdval ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (𝑆 substr ⟨𝐹, 𝐿⟩) = if((𝐹..^𝐿) ⊆ dom 𝑆, (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))), ∅))
Distinct variable groups:   𝑥,𝑆   𝑥,𝐹   𝑥,𝐿   𝑥,𝑉

Proof of Theorem swrdval
Dummy variables 𝑠 𝑏 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-substr 13998 . . 3 substr = (𝑠 ∈ V, 𝑏 ∈ (ℤ × ℤ) ↦ if(((1st𝑏)..^(2nd𝑏)) ⊆ dom 𝑠, (𝑥 ∈ (0..^((2nd𝑏) − (1st𝑏))) ↦ (𝑠‘(𝑥 + (1st𝑏)))), ∅))
21a1i 11 . 2 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → substr = (𝑠 ∈ V, 𝑏 ∈ (ℤ × ℤ) ↦ if(((1st𝑏)..^(2nd𝑏)) ⊆ dom 𝑠, (𝑥 ∈ (0..^((2nd𝑏) − (1st𝑏))) ↦ (𝑠‘(𝑥 + (1st𝑏)))), ∅)))
3 simprl 770 . . 3 (((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) ∧ (𝑠 = 𝑆𝑏 = ⟨𝐹, 𝐿⟩)) → 𝑠 = 𝑆)
4 fveq2 6649 . . . . 5 (𝑏 = ⟨𝐹, 𝐿⟩ → (1st𝑏) = (1st ‘⟨𝐹, 𝐿⟩))
54adantl 485 . . . 4 ((𝑠 = 𝑆𝑏 = ⟨𝐹, 𝐿⟩) → (1st𝑏) = (1st ‘⟨𝐹, 𝐿⟩))
6 op1stg 7687 . . . . 5 ((𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (1st ‘⟨𝐹, 𝐿⟩) = 𝐹)
763adant1 1127 . . . 4 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (1st ‘⟨𝐹, 𝐿⟩) = 𝐹)
85, 7sylan9eqr 2858 . . 3 (((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) ∧ (𝑠 = 𝑆𝑏 = ⟨𝐹, 𝐿⟩)) → (1st𝑏) = 𝐹)
9 fveq2 6649 . . . . 5 (𝑏 = ⟨𝐹, 𝐿⟩ → (2nd𝑏) = (2nd ‘⟨𝐹, 𝐿⟩))
109adantl 485 . . . 4 ((𝑠 = 𝑆𝑏 = ⟨𝐹, 𝐿⟩) → (2nd𝑏) = (2nd ‘⟨𝐹, 𝐿⟩))
11 op2ndg 7688 . . . . 5 ((𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (2nd ‘⟨𝐹, 𝐿⟩) = 𝐿)
12113adant1 1127 . . . 4 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (2nd ‘⟨𝐹, 𝐿⟩) = 𝐿)
1310, 12sylan9eqr 2858 . . 3 (((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) ∧ (𝑠 = 𝑆𝑏 = ⟨𝐹, 𝐿⟩)) → (2nd𝑏) = 𝐿)
14 simp2 1134 . . . . . 6 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (1st𝑏) = 𝐹)
15 simp3 1135 . . . . . 6 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (2nd𝑏) = 𝐿)
1614, 15oveq12d 7157 . . . . 5 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → ((1st𝑏)..^(2nd𝑏)) = (𝐹..^𝐿))
17 simp1 1133 . . . . . 6 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → 𝑠 = 𝑆)
1817dmeqd 5742 . . . . 5 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → dom 𝑠 = dom 𝑆)
1916, 18sseq12d 3951 . . . 4 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (((1st𝑏)..^(2nd𝑏)) ⊆ dom 𝑠 ↔ (𝐹..^𝐿) ⊆ dom 𝑆))
2015, 14oveq12d 7157 . . . . . 6 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → ((2nd𝑏) − (1st𝑏)) = (𝐿𝐹))
2120oveq2d 7155 . . . . 5 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (0..^((2nd𝑏) − (1st𝑏))) = (0..^(𝐿𝐹)))
2214oveq2d 7155 . . . . . 6 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (𝑥 + (1st𝑏)) = (𝑥 + 𝐹))
2317, 22fveq12d 6656 . . . . 5 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (𝑠‘(𝑥 + (1st𝑏))) = (𝑆‘(𝑥 + 𝐹)))
2421, 23mpteq12dv 5118 . . . 4 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → (𝑥 ∈ (0..^((2nd𝑏) − (1st𝑏))) ↦ (𝑠‘(𝑥 + (1st𝑏)))) = (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))))
2519, 24ifbieq1d 4451 . . 3 ((𝑠 = 𝑆 ∧ (1st𝑏) = 𝐹 ∧ (2nd𝑏) = 𝐿) → if(((1st𝑏)..^(2nd𝑏)) ⊆ dom 𝑠, (𝑥 ∈ (0..^((2nd𝑏) − (1st𝑏))) ↦ (𝑠‘(𝑥 + (1st𝑏)))), ∅) = if((𝐹..^𝐿) ⊆ dom 𝑆, (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))), ∅))
263, 8, 13, 25syl3anc 1368 . 2 (((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) ∧ (𝑠 = 𝑆𝑏 = ⟨𝐹, 𝐿⟩)) → if(((1st𝑏)..^(2nd𝑏)) ⊆ dom 𝑠, (𝑥 ∈ (0..^((2nd𝑏) − (1st𝑏))) ↦ (𝑠‘(𝑥 + (1st𝑏)))), ∅) = if((𝐹..^𝐿) ⊆ dom 𝑆, (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))), ∅))
27 elex 3462 . . 3 (𝑆𝑉𝑆 ∈ V)
28273ad2ant1 1130 . 2 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → 𝑆 ∈ V)
29 opelxpi 5560 . . 3 ((𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → ⟨𝐹, 𝐿⟩ ∈ (ℤ × ℤ))
30293adant1 1127 . 2 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → ⟨𝐹, 𝐿⟩ ∈ (ℤ × ℤ))
31 ovex 7172 . . . . 5 (0..^(𝐿𝐹)) ∈ V
3231mptex 6967 . . . 4 (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))) ∈ V
33 0ex 5178 . . . 4 ∅ ∈ V
3432, 33ifex 4476 . . 3 if((𝐹..^𝐿) ⊆ dom 𝑆, (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))), ∅) ∈ V
3534a1i 11 . 2 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → if((𝐹..^𝐿) ⊆ dom 𝑆, (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))), ∅) ∈ V)
362, 26, 28, 30, 35ovmpod 7285 1 ((𝑆𝑉𝐹 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (𝑆 substr ⟨𝐹, 𝐿⟩) = if((𝐹..^𝐿) ⊆ dom 𝑆, (𝑥 ∈ (0..^(𝐿𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))), ∅))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2112  Vcvv 3444   ⊆ wss 3884  ∅c0 4246  ifcif 4428  ⟨cop 4534   ↦ cmpt 5113   × cxp 5521  dom cdm 5523  ‘cfv 6328  (class class class)co 7139   ∈ cmpo 7141  1st c1st 7673  2nd c2nd 7674  0cc0 10530   + caddc 10533   − cmin 10863  ℤcz 11973  ..^cfzo 13032   substr csubstr 13997 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-rep 5157  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-ral 3114  df-rex 3115  df-reu 3116  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-nul 4247  df-if 4429  df-sn 4529  df-pr 4531  df-op 4535  df-uni 4804  df-iun 4886  df-br 5034  df-opab 5096  df-mpt 5114  df-id 5428  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-ov 7142  df-oprab 7143  df-mpo 7144  df-1st 7675  df-2nd 7676  df-substr 13998 This theorem is referenced by:  swrd00  14001  swrdcl  14002  swrdval2  14003  swrdlend  14010  swrdnd  14011  swrdnd2  14012  swrd0  14015  repswswrd  14141
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